T o be shortlisted for AFMC further rounds (TOELR and PI), first you will have to clear NEET as in previous year the cut off was was 570 (boys) 600 (girls) so you are advised to do well in NEET and get a very good score so that you can easily get seleced for TOELR.
Also, the counselling process or the screening tests of AFMC MBBS 2018 admission will tentatively start in the third week of July 2018.
And if you talk about the quota then there is no such defence quota but wards of defence personnel get extra bonus points in interview round.
For reference, you can go through the below link -
Https://medicine.careers360.com/articles/afmc-mbbs
Good Luck!!!
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