Hi aspirant !!

First you need to check eligibility for NEET on official website of National Testing Agency of India which includes :

• Nationality
• Age
• Qualifying Exam
• No. of Attempts
• NIOS and other open schools
• Biology as an extra subject
• Domicile

Then check Application process, Exam Fees, Syllabus and much more.

Here is a complete detailed instruction about everything you need to know to fill NEET form : https://medicine.careers360.com/exams/neet

Hope this helps.