Does any instiute provide crash course for jee mains after the end of 12th board exam or in just in 10 to 15 days

Yes, various online coaching institutes also provide crash courses according to your pocket, such as EtoosIndia. They provide crash courses video lecture which is prepared by Kota top faculties. The best advantage is the student doesn’t need to visit any institutes. A student can do the preparation at Home and if any query, they can sue Doubt Clinic to get an answer on any query within 24 hours.

Yups u can go for various coaching institutes , such as u can go for AAKASH institute crash course and In Kota also there are much high reputed institutes which offers crash course .If u r from Delhi u can go for FIITJEE , VMC, narayana these are some of the best But there coaching fees is quite high just for 1 month or 20 days as Near to Ts 12000

Yes they do.provide but if u are opting for long term course then u can join in them any institute offers coaching even after 12th but u should be applying for long term course.