Hello Arya !

There is no given limit for number of choices. 

There will be 3 rounds of NCHM JEE seat allotment 2019 which will be held on merit basis and the locked choices. The detailed process and schedule of seat allotment has been released on online mode along with the announcement of NCHM JEE 2019 result.

Registered students can modify their choices online and lock them again in round 2 of NCHMCT JEE counselling 2019.

Hope the answer was helpful !