Hello,
Yes you are right for a dropper the qualifying marks of equivalent exam mean the marks of 12th board exam and not previous year neet exam or any other course they had applied too.

For eligibility minimum 60% is required for general category and minimum 50% for obc,sc,st categories with PCB as major subjects.

You can use careers360 college predictor to know the colleges you can get at your NEET score;-