Hello,

CBSE is a concept based education board. The exam paper is unpredictable. Important questions cannot be marked in CBSE board. Same is the case with numericals also.

But you can practice NCERT in-text and exercises given at end of chapter for Chemistry. From the past few years, the external board paper has been given almost 70% from these only.

• There will be good number of questions from Surface Chemistry
• Raoults law
• Absorption isotherm
• Molar mass determination
• Organic chemistry mechanisms
• Numericals on Chemical Thermodynamics, Mole Concept, Solid State & Atomic Structure

You can consider these as some important topics.

You can check NCERT solutions in this link:

https://learn.careers360.com/ncert/ncert-solutions-class-12-chemistry/

Hope this helps.

Thanks.