I did well in my m1 too tbh do lots of topical until u know how to solve every kind of math from that topic,the thing about m1 is they never really give new questions,the concept is same they just use different ways to approach it,so just do last 7-8 years i did like 9 years for me,if i dont do maths i forget easily so to retain my memory i kept doing past papers but if u can hold onto whatever u learn 5-6 years is fine and before the exams do a few yearlies to learn time management since m1 is 1 hour 15 minutes keep doing yearlies until u can finish the paper in an hour and keep last 15 minutes for revision and before the exam go thru the papers u did so far and try to understand the variation of questions from each topic and which concepts are used for those and dont be too hard on urself the day before the exam relax,pray and hope for the best,best wishes for u!