You cannot directly take JEE advance after 12 ^th grade first, you need to appear for JEE Mains.

For JEE Mains,

There is no percentage required to appear in the JEE Mains. However, to gain admission in top institutes like NIIT and IIT, you need to score at least 65% in your 12 ^th grade for the SC/ST category.

For the most updated and accurate information, you should check the official NTA website (jeemain.nta.nic.in)

Yes, as an SC candidate with 48% in 12th , you are eligible for JEE Advanced if you qualify in JEE Main . The 75% rule does not apply to SC/ST categories.

To qualify in JEE mains :

• You must be among the top 2,50,000 candidates (including all categories) in JEE Main .

• The cutoff for SC candidates is generally lower than the general category.

All The Best!!