gcse maths exam q struggle

when doing maths papers i struggle to know what methods i have to apply to solve the question ?? if that makes sense? what i mean is in class when we do end of topic tests i am able to do those because i know what topic/method/formula i need to be using. but in a whole paper they could be testing any topic so when i see a question with a lot of marks i struggle to recognie which methods i need to use
pls can anyone tell me where i can find banks of the harder questions that are found at towards the end of the paper, the ones that are worth more marks. (preferably mixed topic) and in particular i struggle with the questions when they give a diagram and they give you sides, lengths, or angles etc. my exam board is edexcel btw
tysm any help would be appreciated :')