Here are some books to serve your purpose:-Physics Boards- u won't get a better theory than Resnic Haliday Walker.
For numericals, study HC Verma.
Competitive Numericals- DC Pandey or GC Agarwal. Irodov for higher level questions.
Chemistry
Boards- Pradeep publications. There r enough numericals and theory to make u succeed in your boards with flying colours.
Organic for competitions- Dr Jagdamba Singh & S Anandvardhan
Inorganic for competitions- JD Lee.
For numericals in chemistry, u can solve JMDDinesh or Sarin & sarin.
Physical chemistry-
RC Mukerjee or Arihant. Best books for Class 12 CBSE – Mathematics R S Aggarwal & M L Khanna are strongly recommended. For commerce students, Part 1 and 2 by R D Sharma has a great collection of problems. You could also refer to U-Like papers.
Computer Science by Author Sumita Arora, a Dhanpat Rai Publication.