@meimei0602 , per your post you are exempt ( from counting days present ) till the end of 2019. I am assuming here that your F-1 is still valid and you are on OPT and thus still a Non-Resident Alien.
The first year choice requires amongst other things that you will be a resident alien during next year and you cannot make the first year choice till you meet that Substantial Presence Test. Your situation makes it kind of questionable because (a) there is no certainty that your OPT will last till July of 2020, and (b) that your visa will not expire ( assuming that F-1 was for five years) . Can you still do it -- yes; but why would you want to do it -- just to file a 1040 instead of 1040-NR or what. Perhaps you need to answer that and then we can work on how to achieve that.
Note that W-2 by itself does not change your status -- it just allows taxes to be withheld.
Which country are you from ? ( not that some countries have special assertions for students with local income while on training and education ).
