Grade boundaries are one of the most common sources of confusion for A Level Chemistry students.

They determine the minimum mark you need for each grade, but they aren’t fixed — they shift slightly each year.

What are grade boundaries?

Grade boundaries set the minimum number of marks required for each grade (A*, A, B, C, D, E).

For example, if the boundary for a grade B is 62%, then scoring 62% or higher secures at least a B.

They ensure fairness across exam series, even if one year’s papers are harder or easier than another.

Check the latest AQA grade boundaries.

How are grade boundaries set?

Exam boards analyse the overall performance of students nationally before fixing grade boundaries.

If an exam is found to be more difficult than expected, grade boundaries may be lowered so students aren’t disadvantaged.

Conversely, if the exam is easier, grade boundaries may be raised.

Why grade boundaries matter

They give you a sense of how close you are to the next grade and help you set realistic revision targets.

They also explain why the same percentage score might equal a different grade in different years.

See our guide on A Level Chemistry pass marks.

How they affect your revision strategy

Rather than aiming for an exact boundary, focus on building consistent knowledge and exam technique.

Because grade boundaries move slightly each year, it’s better to prepare well above the minimum to feel secure.

Explore free resources from the Royal Society of Chemistry.

Frequently Asked Questions

Are grade boundaries the same every year?

No, they are adjusted annually depending on national performance and exam difficulty.

Do universities look at grade boundaries?

No, universities only see your final grade, not how close you were to a boundary.

Can I predict grade boundaries before results day?

Not accurately — they are only set after exams are marked. Past boundaries can give an indication, but they change each year.

Ready to plan your Chemistry success?