The total number of government MBBS seats in Manipur is 225. Out which 170 seats are for state quota. According to the state merit list of 2019, a marks of 540 fetched a state rank of 42. As 2020 NEET has almost been on the same lines as 2019, so if you're getting 540 this year so there is an absolutely certain chance for you get a government seat. You can predict your rank here

DHS, Manipur is the authority to release the application form of Manipur MBBS. You have to complete the process of registration to get admission through state quota. The date for the release of Manipur application form is yet to be notified. Keep a check on the official site.

To get a list of colleges where you have a chance of getting a MBBS/BDS seat, you can use NEET College Predictor here, https://medicine.careers360.com/neet-college-predictor