Hi Luna!
To answer you better, please specify your board.
Meanwhile, we have attached below the link to access CBSE Class 12 Chemistry PYQs. On solving these, you can prepare for what's important and frequently asked:
https://school.careers360.com/boards/cbse/cbse-previous-year-question-papers-class-12-chemistry
Click on the link below, apply relevant filters to find useful question papers and ebooks:
https://school.careers360.com/download/ebooks-and-sample-papers
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