As per the Dental Council of India (DCI), this year (2022) the session will start from January to September. The session will be short (9 months), so according to that your exam should be in the month of February or March. 

Furthermore if they delay your session it will keep on getting shorter. The second is quite hectic when it comes to preclinical work.

So it is suggested that you write a letter or email your university requesting them to start your exam to prevent further delay in your next session.