This Is a Certified Answer

Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
As you saud you must know each and every line of cbse class 11 and 12 phy, chem, bio  books. Go to for physics and chemistry. Use promo code TH15 for free course.For biology you must get to know of many many biological names and terms. Try out previous year qn. papers.

Plzzz choose it the best answer.