I have done much reading on the matter but I find myself still uncertain regarding my current tax status, because of how the exemption days count for F1 students.
I got my F1 visa and have been studying in the US since January 2013, and graduated as last year in Spring 2018. I worked full-time for the latter part of 2018 and through 2019.
2013-2017: I spent about 8 months on average in the country. 2018: I stayed in the country. 2019: I stayed in the country so far.
Can I consider myself a resident alien now for tax purposes, for filing my 2018 taxes (due April 2019)? For the substantial presence test do I calculate starting from 2019 or from 2018? Can I use the form 1040 now or do I still have to use 1040NR+8843 as I have in past years?