Is your child, friends or any relative is going to give boaed exams. Refer then s. Chand reference which has easy explanation of chapter and diagrams of science and mathematics.
I read both of these and really the explanation are quite better and reflective they are explained with various examples also u get a bunch of questions with answers so u can check your capability to solve problems.
The authentication of writer’s
The s chand book are written by lakhmir singh and manjit kaur who are professional professors and had msc degrees
Do try these books