Hi,
i also came on the tourist visa into this country, and changed to F1 but now a days they are creating a lot of problems. it also depends on in Which country u are and in which place u re getting it stamped on.
First now a days obtaining a I120 is a problem in schools. so check that and then if u get an I20 then u can talk to a good lawyer and file thru them.
But it is a 50 to 50 chances.
Best of luck.
