is there any chances for IIIT

and how should i prepare for adv in last two months

Can you please specify you are asking for which IIIT?

For JEE Advanced preparation you should focus on NCERT books apart from NCERT books you can also go through below recommended books

1- Physics-Concepts of physics by H.C verma
2- Mathematics-Problems plus in IIT Mathematics by A Das Gupta.
3- Chemistry- Arihant master resource book for JEE

Try to give as many as mock test to analyze your preparation level and to know your strength and weakness. Refer previous year papers to understand the exam pattern and level of questions.

All the Best!!

any iiit delhi /Bhubaneswar/guahati/etc