Hello Aspirant,
Yes, if you have secured 320 marks in NEET under the Ex-Defence category, you can expect to get an MBBS seat in a government college in Karnataka, as per the trends of seat allotment in the state quota for reserved categories. However, it also depends on the following factors:
In the last few years, Ex-Defence candidates with marks of 310–340 have been allotted seats in MBBS courses in government-run colleges, especially in less competitive colleges or rural colleges or Hyderabad-Karnataka region colleges. However, your chance might differ from year to year.
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