Can anyone please recommend good books for chemistry, physics and biology? ( for a 14-15 year student)

Answer 1

Have you already looked at open stax?

My favorite all-around for chemistry is either Zumdahl Chemistry, or Tro: A Molecular Approach. Timberlake is a more simple chemistry book that is also good.

For Biology, Campbell is good.

For physics, I liked Serway.