Hello,
NEET is the largest entrance exam for admission to medical, dental courses and you will have to work hard to perform well in the exam and get admission in decent medical college. To start your preparation, firstly check the detailed syllabus and pattern of the exam.
You should formulate a study plan to manage your studies. Refer to NCERT textbooks. Clearing of  basic concepts is essential and NCERTs are the best books. Studying thoroughly from the NCERT books will help you alot.
You should also refer to other important books for in depth knowledge.
Solve previous year question papers and mock tests. It will help you to know about the types of questions asked in the exam, difficulty level of the exam, etc.

With regular revision and continuous practice you can achieve a good score.

Go through the link below to check the details

https://medicine.careers360.com/articles/neet-2019

Good luck!

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