Exam discussion

Hey guys so I am preparing for JEE and I did a huge mistake in my physics exam that I read all my jee notes and practiced the jee questions but when I reach to the exam hall, I came to know that I did the biggest mistake I don't want to repeat that mistake in chemistry so I have already completed my chemistry syllabus according to JEE and currently I'm watching all the video lectures of NCERT wallah for chemistry chapters. Is it enough? I am not going to read NCERT because I think that lectures are enough and I will go through the NCERT questions and will practice the sample paper do I need to do any thing more to score good marks?