hello aspirant,

since, there is some time left for the exam to conduct so I would suggest you to go through all the chapters once , all the chapters are important if you want to score 170+ marks in the exam, most importantly make sure that your concepts are clear from NCERT and then only go for other reference books.

so yes, prepare all the chapters for once and the chapters you think are a bit important to you are you are finding it difficult to understand, refer to site books.

make sure you-

• Make a note of every important point
• Don't go for night studies
• Don't go more then an hour for preparation. Change the subject.
• Go for weekend test by testing yourself by attempting model papers
• Focus on each thing
• Understand what you are learning
• Don't be in a hurry to complete.But try to complete everything with a clear picture.

.

hope that helps