Is there need to do Bio. with any other Reference OR to do it with only N.C.E.R.T.

For Class X exams, NCERT book must be thoroughly studied as all the questions are usually based on the NCERT book. Use the reference book used by your teacher to enhance your learning like getting additional points, simpler explanations, better illustrations, more examples etc. Also reference books can be used to get the answers to the questions and puzzlers asked in NCERT