Hello!

It is extremely important to concentrate in 11th syllabus too. Don't take your 11th syllabus lethargic they are the game turners in JEE as well as NEET. During your holidays 11th-12th summer vacation complete your 11th syllabus and start working with 12th syllabus. Before KVPY, JEE as well as NEET take mock papers, with time limit. Do not take even extra 1minute during practice. When it comes to competitive exams that too when they have negative marking scheme, do not give a try for answers which you don't know. For mock practice make use of embibe (google it). For concept learning and topic wise practice use H.C.Verma for Physics, Solomon's Fryle for organic chemistry, use your textbook for inorganic chemistry (NCERT (CBSE) for reference for detailed learning. Use pdf), P Bahadur's book for physical chemistry, RD Sharma objective for mathematics and (NCERT book is an excellent source) Objective biology by Dinesh for biology. Taking mock will teach you lots of new concepts. Atleast take 20mock papers before exam.

Prepare well, do not waste time. ALL THE BEST. Hope the answer was helpful.

Thank You