This are all dependent on the decision taken by the Government based on the Covid situation as well as the decision as taken by CBSE. So anything can't be predicted from now, but yeah! there can be possibilities as there are many students who want to sit for improvement examination.

For Improvement examination visit the link below:

https://news.careers360.com/cbse-classes-10-12-improvement-and-compartment-exams-start-from-today

I hope this helps.