EB2 has two options: 1) employment based -need to go through PERM 2) national interest waiver (NIW) - file I-140 and I-485 directly EB3- has to go through PERM To file under EB2 category, if you have a masters degree or a number of years of experience, you can. It is not necessary that you have to file under NIW. If you qualify, it is best to file under EB2 because it is faster.