hey nivetha , 

Glad to know that you have solved 10000 questions. Infact , the number of questions solved doesnt matter. your hard work matters. It is more than enough I think. All you have to do is just understand the concept and the question patterns. It also partially depends on your luck and the way you train your thinking. 

One thing to be followed in any entrance exams is that TIME MANGEMENT. How much ever you solve , unless you can manage your time, you can't score much. So practice time management. 
Second thing is that Understand the questions given. Often we all do one mistake, where we dont understand the question, it has happened with me as well. Lack of understanding of question leads to giving more wrong answer. 
Third thing , once after thinking you choose an option, Make sure to mark it properly. When you are in doubt, you can mark the question for review. And later , you can consider the doubt in back of your head and clarify. Pondering over a question and not moving to next question, results in often lack of time for which even known answer becomes Unknown. 

All these are crucuial tips which helps in cracking NEET. Since youve already solved almost 10000 questions, it is better to take up mock tests. These Mock texts help you in undestanding where do you stand comparitively. It also is easy to understand completely and avoid common mistakes. Mock tests also gives a person time to think and understand their loopholes . 

Also, For NEET and other entrance exams, NCERT text book definitely serves as a bible. 
for further preperation , you can refer to this article : https://medicine.careers360.com/articles/neet-2019. 

NEET is one of the tough exam. It is conducted by National Testing Agency (NTA). So prepare well. 

Good Luck, Alll The best.