Hello aspirant,

The best reference books for Biology is:

• NCERT biology for 11&12
• Trueman's objective Bio for NEET(if you are willing to clear NEET)

The best reference books for Organic Chemistry:

• NCERT Chemistry
• Organic Chemistry by Morrison and Boyd
• Physical Chemistry by O.P. Tandon

The best reference books for Inorganic Chemistry:

• NCERT Chemistry
• Conceptual Inorganic Chemistry
• Huheey and Keiter 

For Biology, you can refer to Trueman's Biology and Comprehensive Biology.
For physical chemistry, you can refer to Physical Chemistry by OP Tandon.
For Organic Chemistry, Elementary Problems in Organic Chemistry by MS Chauhan will be a good choice. You need to practice organic chemistry to clear your concepts. For the inorganic part, you can refer to Concise Inorganic Chemistry by JD Lee.
All the best!