In which year I have sit for the neet exam

You need to have eitjer completed your 12th or atleast be appearing for 12th exams in the year of NEET. You should be 17 years atleast by December 31st of the year of admission. For example, if you are planning on appearing for NEET 2020, then the eligibility looks like this:

ELIGIBILITY:

• Indian Nationals, NRIs, PIOs, OCIs, and Foreign Nationals
• No upper age limit as of now. The Candidate should be at least 17 years by December 31st of 2020
• You should have completed your 10+2 with Physics, Chemistry and Biology as your Core Subjects.
• 50% Aggregate in Physics, Chemistry and Biology for General Category, 45% for PWD and 40% for OBC,SC,ST Candidates.
• NIOS and Private Candidates are also eligible

IMPORTANT DATES:

Registration Dates: 2nd to 31st December, 2019
Downloading of Admit Cards: 27th March, 2020
Date of Examination: 3rd May, 2020
Date of Announcing Result: 4th June, 2020