PapaCambridge 上面有全科每届的pastpaper和markscheme。网址：https://papacambridge.com/home/index.html ...
You can find the pdf of the model solutions, as well as the question paper and the mark scheme on ourOCR (A) Chemistry A-level Paper 2page. Each question is bookmarked in the progress bar of the video. Read MoreHow to name organic compounds in ALevel Chemistry | PMT EducationGCSE exa...