I would suggest doing Corbett maths 5-a-day every day (as you’re on a 2 probably start on the numeracy sheet and maybe try foundation but see how you go) and then for the questions you get wrong, watch a video on Corbett maths, Cognito or gcse maths tutor to learn the topic. Then once you think you understand, do practice questions on Corbett maths as they have massive collections of questions on each maths topic 🙂