Hello aspirant,
NEET mds entrance exam contains 240 multiple choice questions from the subjects which you studied in BDS programme .
The important  topics which you have to study and covers maximum marks  are :
1)conservative dentistry .
2)Dental materials .
3)general medicine .
4)general surgery .
5)oral medicine and radiology -15 marks .
6)oral pathology and oral microbiology.
The exam scheme is online based computer exam .
And exam is conducted in single session .
Start preparkng now ,it will be very useful to you .
Hope this helps,
Thank you