> I studied my MS in USA. I am currently on H1B visa. My employer filed
> my I140. Now I want to study my PhD. I have very good chances of
> getting into my PhD program in top schools. If I file for F1 visa
> somewhere in a blog I read that my visa will be rejected because I
> show the immigration intent by filing my I140. What is the right time
> to transfer to F1 without disturbing my GC process (if possible) or
> leaving GC process and transfering to F1. Your help is very much
Once an I-140 is filed, it is, as you found out, pretty much impossible to
change to a status like the F1 that doesn't allow immigration intent.
There is no workaround.
I am not a lawyer.
For reliable advice, consult a competent immigration attorney.