This year 1 month, I put forward the priority of F2B family immigration, and then I will apply for studying abroad after taking GRE this year. Will two visas conflict?

Generally speaking, the American embassy will not issue student visas to students who apply for immigration. Because the student visa is a non-immigrant visa, that is, you will return to China after completing it. But you have applied for immigration, so your two applications are contradictory. However, people in the same situation as you have obtained a student visa, so in fact, American visa officers generally don't give it to you, but if your grades are particularly good, or he doesn't notice that you have applied for immigration, he may give it to you.