Hi

GREETINGS

Maximum marks for JEE advanced is not fixed in keeps on changing every year therefore we cannot tell you how much marks you need to get to get ST rank of 400 also there is not a particular pattern in the ST category rank therefore it is very difficult to tell you the exact marks also there is lot of changes in the difficulty level of the JEE advanced therefore marks vs rank keep on changing every year however we can assure you that if you score more than 30% marks then you will get very good rank in ST category

All the best