JEE Advanced

I don't exactly know the cutoff for st, overall n subjectwise too. please give me the information so that I can help u

There are many in every state. Well known for their respective methodology. In big cities, they have institutes from kota too

congratulation first
u have got great rank in sc category
but for your information
there r 1500+ seats reserved for sc category student
IIT-d takes admission of those sc candidates whose rank lies within 1-250(sc rank)
now only luck will work

Eligibility criteria for JEE has always been of minimum 60% in PCM.

no its not compulsory

Yes of_course u can get because of reservation

Yes you can take admission through sc quota

Udit I feel dropping an year is not a good idea. What if you don't get good marks or even this much of marks next year. Better would be go for admission this year only. If you are not able to get admission in a good govt.institute with these marks, these marks can get you good private universities.
These days even private universities are imparting quality education to the students around the world. They offer you admission on JEE scores/ tests conducted by them/ your marks in 12th. Some of these also offer good scholarships based on any one of the above mentioned admission criteria.
Good luck.

if you belong to sc / st category then definitely you will get IIT but for open category no chance of getting IIT