Dear Ajmal 

In 2018, both AIIMS and NEET entrance exams will take place. NEET entrance will be held  May 10, 2018, while AIIMS MBBS entrance exam will be held on May 27, 2018.

The application forms for NEET are likely to be made available at the end of the month of January 2018, while AIIMS MBBS forms are likely to be released in the starting of February 2018.

You can know all about both AIIMS and NEET entrance exams from the links given below:

AIIMS MBBS Entrance Exam

NEET Entrance Exam

I hope it helps.

Good Luck.