Hello Priyanshi,

To be able to take NEET exam after your 12th boards you need to check yourself against the eligibility criteria proposed for the exam, which is as follows:

• Indian nationals, OCI, PIO, NRI and foreign candidates will be eligible to apply.
• The minimum age limit will be 17 years as on 31st December 2019.
• Candidates must have passed 12th or equivalent exam from any recognized board.
• In the qualifying exam, students must have physics, chemistry, biology/biotechnology and English subjects.
• Candidates should have obtained minimum 50% marks (for general), 45% marks (for general PH) and 40% marks for SC/ST & OBC candidates in the PCB stream.
• Candidates appearing in the qualifying exam are also eligible to apply.

In case you are befitting the aforementioned criterion you can take the NEET test. However you will not be able to take the test if you have not applied for it as the applications closed in December itself. But you can apply for NEET 2020 when the application starts. 

All the best.