is NCERT books enough to clear cut off in NEET. my category is SC.

Hi, NCERT plays an important part in preparation of NEET exam.
NCERT are simple to understand and very direct in approach.
So it will form your base if you get through it thoroughly.
But at time to understand the complexity of the questions we need to get professional guidance and that we can get through some reference materials.

For BIO- you don't need any other book. NCERT is enough.
For Chemistry  For inorganic you won't require that much but yes for organic you will need some higher level questions.
For Physics theory purpose refer to S.L Arora

You can refer to last year papers, Question banks and PRACTICE with  mock tests.
Good Luck.

NCERT books are helpful to clear your concepts and to build strong fundamentals. To score good marks in your exam you need to prefer past year papers to understand the exam pattern and level of questions asked in the exam. You can go through MCQs for your practice and complete mock test series to analyze your preparation level and to know your strength and weakness.

All the Best!!