The right approach to preparing for a competitive exam is to start with NCERT question answers; try to read all the concepts, formulas, important theories, and all the important points mentioned in the NCERT textbook, try to make useful notes of all those concepts and points.
The most important factor for any competitive exam is time management, so start by understanding the correct exam syllabus. NCERT textbook questions are recommended for almost all competitive exams. NCERT, therefore, plays a very important role in learning for all competitive exams. In NEET 2019, almost 80% of the questions came directly from the NCERT textbook.