Best resources for past year Question papers and marking schemes

Best textbook resources for past year Question papers and marking schemes - Maths and Further Maths ( Pearson Edexcel), Physics ( Eduqas) and Computer Sc (AQA). Which resources are helpful to crack exams apart from the board prescribed textbooks?

The exam boards websites have much more up-to-date papers, mark schemes and examiner reports. The latter sometimes give examples of how specific questions were marked.
Edexcel also have teacher-only web areas so ask them if you need anything specific.