@pramodp953 , since you were admitted to the USA in Aug 2015 ( under F-1 ?? ), you would be in exempt status ( i.e. from counting days present towards substantial presence test ) till the end of 2019. Assuming that there has not been any adjustment to your visa , for 2019 you would file as a Non-Resident Alien i.e. using form 1040-NR or 1040-NR-EZ. Note these two forms are not supported by TurboTax ---their partner in this is SprinTax. You can also inquire at your school's foreign student office -- they will guide you to a source for filling out this form. Did you get a W-2 from your OPT employer or a 1042-S ? It is not too difficult to fill up the form 1040-NR-EZ -- one can download the fillable .pdf from www.irs.gov, fill out and mail it in .
Is there something else I can help you with ?
Namaste
