I'm also doing edexcel in year 12, i did get a tutor so that helped a lot but otherwise youtube is so useful! i tend to make notes from my textbook, do a couple dr frosts and watch youtube videos if im struggling on a topic and then do a mixture of past papers, practise questions and mixed exercises from the textbook (physics and maths tutor is great for testing your knowledge and finding out the topics you may need extra help in). one of my main recommendations would be to ask your teacher tho (i go to a high school sixth form so depending on the type of school youre studying at that may be harder for you) i know its hard to ask especially as i was very behind at the start of the year considering i didnt do further maths gcse and i wasnt in set one for year 10/11 however its the best way to learn.