Hello ,

Yes it is possible , If your really thorough with NCERT you can crack any competitive exam , even you can clear JEE and JEE advance if you are really thorough with NCERT and even can slove additional problems mentioned in NCERT , Example in Physics text NCERT there are lot additional problems in electrostatics ,  which are not often asked in board exams but most of its concept used to solve such  problems are seen in competitive exams like JEE and NEET

All over India NCERT is treated as base , so make sure you are thoroug with NCERT to the core so that you can get good scores in 12 th board exams as well as crack entrance exams and get into your dream college of dream branch

Hope this helps you

Best wishes for your future