For JEE advanced qualifying marks for open category is 35% of the total marks of JEE advanced for SC category it is 17.5 percent of the total marks is the total marks are not fix there for this are only percentage but in the past there were instances that due to the higher level of difficulty the cutoff are reduced but remember this are the maximum cutoffs.

Cut-off for JEE Advanced 2018 was -

General category : 90

Other Backward Classes (OBC-NCL) : 81

Scheduled Caste (SC) : 45

Scheduled Tribe (ST) : 45

For more Information about the cutoffs and other related issues you can follow our link:

https://engineering.careers360.com/articles/jee-advanced-cutoff