Dear aspirant,

I would recommend you to follow one material religiously to Ace any competitive exam. A lot of toppers have mentioned this in their interview as well. Look at the official syllabus of whatever competitive exam you are preparing for and try to compare it with the study material that you have. Refer other materials only if you feel like the topic  in the syllabus is not covered in the material. Take help from other material whenever you don't understand the concepts well from your material. After solving your material religiously, solve previous year questions and take times tests.

This should help you Ace your competitive examination

I wish you all the best