What visa should I apply after marrying a Brazilian greencard owner that currently lives in the US?

U.S. Immigration requires everyone to wait for their turn. seek advice to find out if you have other options.

Can I do a 3 year residency on OPT with the 2 year extension?

Check with the college if they would give you an I-20. I have not heard of an F-1 paying full tuition to attend med school. The immigration...

When do i expect a response of receipt and a tracking number for the form I submitted to uscis . For F1 change of status

It takes about 2-4 weeks to get a receipt notice.

What are my options

As a Syrian you may be able to apply for temporary protected status but you may be eligible to apply for asylum.

This is an interesting question the answer to which you probably already know.

I am a DACA recipient, which way would be faster to get a green card? Getting married to a Citizen, joining the military?

I always prefer the better way rather than a faster way to achieve the immigration goal.

Is it OK to marry my boyfriend in the U.S. while he is on a tourist visa and then he will return to his county to file I-130?

There are some fine lines here especially when you post on a public forum. Hopefully it should work. Best!

Need some suggestion on EAD and H1 B

You seem to be maintaining status this far. Please seek advice and stay informed.

What will be the next step after receiving i797c fee waived

Properly file the immigration application. Wait times keep changing.

How I can fix my legal status, and what can I do to fix my status?

You did not say that you have DACA authorization, it has some eligibility limitations. Marriage based permanent residence seems like an option...