OCR GCSE Chemistry Foundation Tier Tutors

Leading Tuition's OCR GCSE Chemistry Foundation tier tutoring is one-to-one teaching for the two Foundation papers of either OCR chemistry GCSE: Gateway Science Chemistry A (J248) or Twenty First Century Science Chemistry B (J258). OCR sets Foundation at grades 5 to 1, on two papers of 90 marks and 1 hour 45 minutes each. Check which code your school teaches first, because the two sets of Foundation papers are built differently.

Everything below is read from OCR's own documents: the J248 and J258 specifications (Version 4.0, August 2026), the board's grade-boundary documents for four June series, and the examiners' reports for the Summer 2025 series. Each section ends by saying what it changes in the way we teach. Our OCR GCSE Chemistry page explains how the two specifications relate and compares the two most recent series on both routes, so that comparison is not repeated here.

Foundation marks by paper across four June series

OCR publishes one boundary document for each June series. The rows below are copied from OCR’s June grade boundary documents for the four series, Foundation tier only. Component 01 and component 02 are each marked out of 90; the overall row is out of 180. OCR adds a caveat to its component rows, in its own words: ‘Grades’ at component level don’t automatically add up to the same grade at qualification level. A component row is therefore a mark on one paper, not a grade for that paper. Boundaries for the Higher papers are published in the same documents but belong to different papers, so they are left to our Higher tier OCR GCSE Chemistry page.

Gateway Science Chemistry A (J248): raw marks needed for grades 5 to 1

Across the four series the overall grade 5 boundary on J248 ran from 110 to 120 out of 180 (61.1% to 66.7%), grade 4 from 92 to 100 (51.1% to 55.6%) and grade 1 from 20 to 29. The component rows show a pattern inside the tier: the grade 4 boundary on Paper 1 was 52, 53, 54 and 54, and on Paper 2 it was 40, 47, 43 and 46, so Paper 2's sat lower in every series, by 12, 6, 11 and 8 marks. The two papers cover different topic blocks and are marked on their own scale.

What this changes in a session. We mark each J248 mock paper against its own column in the table, not as one blended percentage, so a student who is strong on Paper 1 and short on Paper 2 sees which block to rebuild. And because the overall boundary moved by up to 10 marks at grade 5 between series, we plan to the top of the range, 100 of 180 for grade 4 and 120 for grade 5, then adjust once there is a run of real mock marks.

Twenty First Century Science Chemistry B (J258): raw marks needed for grades 5 to 1

J258 moves much more between series. The overall grade 5 boundary ran from 86 to 115 out of 180, a spread of 29 marks (47.8% to 63.9%), and grade 4 from 70 to 95, a spread of 25 marks (38.9% to 52.8%); grade 1 ran from 20 to 29. From the 2024 series to the 2025 series grade 5 rose by 29 marks and grade 4 by 25. The two components do not move together either: Breadth's grade 4 boundary was 35, 35, 51 and 45 while Depth's was 42, 35, 44 and 42, which puts Breadth 7 marks below Depth in 2023, level in 2024, 7 marks above in 2025 and 3 above in the latest series.

What this changes in a session. No single year's J258 boundary is a safe target, so we never set one. We plan to the top of the four-series range, 95 of 180 for grade 4, and we track Breadth and Depth separately because their boundaries have crossed over. A J258 student whose Depth marks are consistently ahead of Breadth marks gets a different next fortnight from the reverse.

Where Summer 2025 Foundation candidates lost marks, and the session step for each

Boundaries say how many marks. OCR's examiners' reports say where candidates dropped them. Each point below is attributed to its own paper and series, and each is followed by what we do about it.

• J248/01, Summer 2025. OCR's examiners report that candidates who did less well did not show working in calculation questions, confused litmus and universal indicator, confused exothermic and endothermic reactions, and copied information from tables in the questions rather than interpreting the data. In Section A, Questions 4 (polymers), 10 (state symbols) and 13 (products of a salt preparation) proved particularly challenging. Session step: every calculation is written as working first and answer second, because the same report says the most successful candidates showed full working so that partial credit could be awarded even where an error was made. State symbols are in plain type in statement C3.1f, so they are drilled as a fixed routine, and a colour-and-result grid for indicators is rebuilt from memory each week.
• J248/02, Summer 2025. The report says a very common mistake in Question 17 (b) (ii) was to calculate the mass of 3H₂O as 22, that is (3 × 2) + 16, and that a large number of candidates who gave the wrong answer still gained partial credit for showing their working and giving two significant figures. It also lists candidates who seemed unfamiliar with basic laboratory procedures such as titrations (Question 20), missed vital instructions given in the question (Question 18 (c) (ii)) and, in Question 19 (b), spotted ‘global warming’ but wrote about causes rather than consequences. Session step: formula masses are done with the whole formula bracketed before any multiplication, the titration is talked through as a procedure (statement C5.1b, plain type) rather than as a diagram, and every question is read twice with the command word and the topic word underlined.
• J258/01 (Breadth), Summer 2025. OCR says candidates who did less well read questions hastily because of the pressure of the examination, so they missed part of what the question wanted. Session step: timed sets of short Breadth-style questions where the only thing marked is whether every part of the question was answered.
• J258/02 (Depth), Summer 2025. The report names four things. Candidates did not demonstrate familiarity with laboratory apparatus (Question 7 (b) and Question 9). The extended prose in Question 3 (b) (ii) and Question 7 (b) was a challenge for some. In Question 5 (b) (ii), expressing the increase as a percentage was not well understood, and the need to answer to one decimal place was frequently missed. In Question 1 (a) (i), sulfuric acid was the most common response, which OCR says indicates that many candidates did not understand formulae. Session step: apparatus is handled or sketched rather than read about, six-mark answers are built from the question stem, percentage-change questions are always finished to the decimal places asked for, and formulae are written from the ion charges rather than recalled by name.

What each Foundation paper contains: Gateway A against Twenty First Century B

The two codes share a tier structure and little else. J248 splits its content between the papers by topic block; J258 sets both papers on the whole course and separates them by the kind of question. The table is taken from each specification's assessment section.

J248 names its topics C1 Particles, C2 Elements, compounds and mixtures, C3 Chemical reactions, C4 Predicting and identifying reactions and products, C5 Monitoring and controlling chemical reactions, C6 Global challenges, and C7 Practical skills. J258 names eight chapters, from C1 Air and water to C8 Practical Skills, with C7 Ideas about Science in between. Both specifications permit a scientific or graphical calculator on components 01, 02, 03 and 04.

What this changes in a session. On J248 we teach in the order of the papers, C1 to C3 first, then C4 to C6, and we revisit C1 to C3 inside the second block because Paper 2 assumes it. On J258 there is no block to hold back, so we work chapter by chapter and, within each chapter, practise both styles of question: quick, wide Breadth questions and the longer Depth questions where the 6-mark answers sit. The AO weights point the same way. A Depth paper is weighted more towards applying and analysing (AO2 22 and AO3 12) than a Breadth paper (AO2 18 and AO3 8), so Depth practice leans on unfamiliar data and short reasoning chains rather than recall.

What OCR prints for Higher only in J248, and what Foundation keeps

The J248 Tiering box reads: “Statements shown in bold type will only be tested in the Higher Tier papers.” Every other statement is assessed at both tiers. The list below was read from the printed type, statement by statement. The right-hand column shows what Foundation keeps; the middle column shows exactly what Higher adds.

One detail needs stating exactly. Statement C3.4d, which asks students to describe electrolysis in terms of the ions present and reactions at the electrodes, is printed in plain type, so it is assessed at both tiers; the words “half equations” in its To include column are printed in bold. OCR’s Tiering box refers to statements shown in bold type, so we do not treat C3.4d as Higher-only.

What this changes in a session. A Foundation student on J248 does not spend hours on the mole, the Avogadro constant, stoichiometry, concentration in mol/dm³ or gas volumes, because OCR prints each of those in bold. The time goes to the plain-type quantitative chemistry in every Foundation paper: conservation of mass (C3.1i, C3.1j), theoretical mass (C5.1g), percentage yield (C5.1h) and atom economy (C5.1j). The J248/02 report shows why: candidates still lost marks on a formula mass inside a mass calculation in Question 17 (b) (ii). Where Higher adds only a layer to a plain-type topic, as with oxidation and reduction in terms of oxygen (C3.3a) against electrons (C3.3b), we teach the plain-type version fully and stop there.

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What OCR prints for Higher only in J258, and what Foundation keeps

J258 words the convention differently: “Emboldened statements will only be assessed in Higher Tier papers.” Outcomes are numbered within each teaching item, so C5.3 outcome 4 is item C5.3, outcome 4.

What this changes in a session. A J258 Foundation student works the plain-type calculations in C5.3 (relative formula mass, theoretical mass, percentage yield) and C6.4 (atom economy); the Avogadro constant, moles, stoichiometry and the concentration calculations in C5.3 and C5.4 are left to the Higher papers. Ionic equations are Higher-only in C3.2, so equation work stops at balanced chemical equations. Oxidation and reduction are taught as gain or loss of oxygen, the plain-type version in C4.5.

Grades 5 to 1 and the tier choice, in OCR's words

Both specifications carry the same sentence in their Tiers section: Foundation Tier assesses grades 5 to 1 and Higher Tier assesses grades 9 to 4. An allowed grade 3 may be awarded on the Higher Tier option for learners who are a small number of marks below the grade 3/4 boundary; it belongs to the Higher option, not to Foundation. Learners must be entered for either the Foundation Tier or the Higher Tier.

• One sitting a year. Both specifications state that one examination series is available each year in May/June to all learners.
• Retakes stay in the tier. J248 says learners retake all the papers within the relevant tier; J258 says they retake all components in the tier of entry. A retake covers all the papers of the tier being sat, so Foundation preparation is built around the full set of Foundation papers.
• Calculators and the Periodic Table. A scientific or graphical calculator is permitted on components 01, 02, 03 and 04. Appendix 5h of J248 and appendix 5g of J258 each print a Periodic Table of elements, with a key showing atomic number, symbol, name and relative atomic mass.

The specifications are on OCR’s site for J248 Gateway Science Chemistry A and J258 Twenty First Century Science Chemistry B. A family unsure which code applies should ask the school for the code and the tier of entry.

How the Foundation tier programme runs

A programme starts from the code and the entry tier, then from the student’s most recent mock, marked paper by paper against the boundary columns above. That gives a short list of the plain-type statements costing marks, worked in the order of the student’s papers: for J248, C1 to C3 before C4 to C6; for J258, chapter by chapter with both question styles.

Four habits run through every session because the examiners’ reports name them: working shown for every calculation, each question read for its command word and topic word, six-mark answers built from the question stem, and practical procedures talked through rather than memorised as lists. Sessions are one-to-one with an expert chemistry tutor, and the content stays inside what the student’s tier assesses.

Families who want the maths side covered can read about our Foundation tier OCR GCSE Maths tutoring, since both chemistry specifications set a minimum share of mathematical skills in the papers.

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