All Question Generator and Exam Practice questions have a difficulty level from 1 - 4, which can be seen when adding questions to a worksheet.
Difficulty levels are designed to help teachers select questions of varying challenge within a particular skill. They are not intended to compare the difficulty of questions across different skills. For example, a challenging skill such as 622: Solving linearly separable first order differential equations may still contain difficulty 1 or 2 questions if those are the easier questions available for that skill.
Difficulty levels are an internal Dr Frost scale and are not directly linked to external standards such as GCSE grades. However, for Exam Practice questions, Foundation tier questions are often around difficulty 1–2, while Higher tier questions are more commonly around difficulty 2–3. Difficulty 4 questions are generally reserved for more extended or particularly challenging problems, such as Maths Challenge-style questions.