Hello Suresh, if you are preparing for any exams which include 12th standard syllabus, you can opt for handbooks as they only contain formulae and they are easily carriable and can work as a reference tool or short revision tool whenever you require, I suggest you to buy Handbook of Maths, Physics, Chemistry by Arihant which is great for learning.

Hope this helps.

Thank you.

Hello,

You can get all formula books for physics, chemistry and mathematics on various websites online and on your android device as there are many Apps that offer that. You can use "GYAN SUTRA" its a all formula book for physics chemistry and mathematics. You can surf internet for more information.

Hope this helps.

Regards,

Arin