Some questions from the community:
a. If I want to get my F-1 stamped from India, do I need to submit I-539 form also to the ISO of my school ?
No. An I-539 is used if you want to change status within USA.
You need to check with your school about CPT. The requirements for OPT as I recall are two full semesters on F-1.
No one can predict that. Sorry.