Dear Ayush,

Based on your rank in JEE Advanced, the chance of getting top IITs is very less. Do try with other private Institutes that accept JEE Advanced Score or apply for IISER.

Check the previous year cut-off for IITs using the link: https://engineering.careers360.com/articles/jee-advanced-cutoff

To know more about IISER Admission 2018, use the link: https://engineering.careers360.com/articles/iiser-admissions

All the best.