H1B/GC to F1

[H1Tracker]

My 6 year quota of H1b would expire in 1.5 years. I have started GC PERM process from my company last month. Next year I have plans to join a business school for which I understand,
I would have to change my status to F1.

1) To my knowledge, having imigration intent will be an issue in getting F1. Is it possible for me to change my status to F1 if I stop my GC process before I start with I140.
2) There are several milestones in the GC process. If I m willing to wait for time, say 2-3 years, will I be able to join a school (with/without F1) after reaching one of these milestones.
3) Is there a way I can join school without affecting my green card process.

[txh1b]

Tough to get a F1 status change or a visa after the fact that you have expressed a desire to immigrate by means of a labor filing. You can join school while maintaining H status and studying part time or FT.