It’s december & you have three months in your hand to work hard & get a good percentage 

start paying attention in class so that you can cover up the topics being taught

study them side by side

then come to the topics you have not done sit down learn & Clear your concepts do all this till end of january .

in feb you will have plentiful time for a good revision

this is the time  that decides your future 

don’t waste your time . Good luck

Dear Nishant

You will get or not. That totally depends upon your own preparation. Infact CBSE also won't able to say you that in this much span of time of preparation you will be able to get this much or that much of percentage. So overall depending upon your today's preparation you should plan the proper stratigies and planning such that according to that you should make your routine and with that you can able to take your schedule and try to complete within a proper span of time such that you should also have the enough time for the revision as well. So try to make your schedule with you own and divide the proper time for each and every subject.

All the best