@JudyJY , generally if you had not been in the USA at all during the prior three years, or never used the exempt status ( F, M, J etc. ) then you should be exempt for five calendar years. During exempt days , you nto counting days present AND you are therefore a Non-Resident Alien. I am giving general answer because I still don't know when you entered the USA with F-1 and if you had been to the USA ( what visa, which years and for how many days each time). I do see that you were in the USA with B visa but I need the whole story here . I also don't understand why your visa is for three years and not the usual five years --- what education are you doing ( is it a course for two/ three years ? ), like an MS or special training or what ?
My suspicion is that you are probably still an exempt person, Non-Resident Alien.
Note that the tax treaty with most countries, monies received by students from home country is not taxable income ( so please tell me the country where your parents reside and/or are citizen of ). Of course you should also note that your US bank would have raised a SAR ( Suspicious Activity Report ) as a matter of course on any activity above US$ 10,000. Mostly nothing happens to these.
I will circle back once I hear from you
pk
