Hey mirtunjay,

As per my information and research students can apply for jossa counseling even if you have one subject to give compartment.But at the time of seat acceptance and for counseling you'll have to show your passing 12th equivalent certificate for proof along with other documents.

For more details you can refer to the link mentioned below-

https://www.google.com/amp/s/engineering.careers360.com/articles/josaa-counselling/amp

Good luck.

Hope it helps.