If you want to take admission in the course of BTech through JEE MAINS then the best option for you is the JOSAA counselling. Don't know if you have registered for it or not. Apart from this there are many college which also accept the JEE MAINS rankings (private colleges) which can provide you admission without counselling. But this are very less and probably unknow and if you want to do so then you have to visit the college of your choice. so if you wish to get admission on the basis of JEE MAINS rank then you must go for the JOSAA counselling because it will give you a more opportunity.

To know more about the JOSAA counselling visit the link below:

https://engineering.careers360.com/articles/josaa-counselling

I hope this answer helps. All the very best for your future endeavors!