Hello, 

Please divide a time of neet and board so that you can concentrate on both the exams . If you're belong to CBSE board then it will every easy for you to concentrate on both the exam like when you're preparing for board do the lot of learning and understanding and in the time when you're preparing for neet do the MCQ on that time of the same topic you're readed at the time which your giving to the board . 

If you're belong to state board then you have to study hard as the course for neet and state board are quite different .