In order to score good marks in chemistry make sure your concepts are clear and you build strong fundamentals.

You should read NCERT book throughly and solve all the questions which are given at the end of the topics. After that solve NCERT exemplar.

Sometimes, you can also get direct questions from NCERT books.

It is recommended that you should focus and complete first the topics which carries more weighatge in the exam.

All the best for your preparation!!