Give importance to the common topics for Board and NEET exams.
As soon as you start your preparation, make notes of important points, formulas, reactions and other information. It will also help in your revision.
All subjects are equally essential, so don't focus exclusively only on one subject. So make an effort to dedicate each subject an appropriate amount of time.
To improve your understanding of concepts and weak areas, practise a number of mock tests.
Eat healthily, get enough sleep, revise each morning, have a positive mindset and keep yourself away from digital entertainment.All the best!