他马上要毕业了，已经拿到下一级学校的offer，要换学校可能需要重新申请学生签证？
-Just do the F-1 transfer within US (talk to the international student office in both schools and they will take care of it). But if he leaves US, he needs to get the F-1 visa in China to come back using the new i-20 from the new school.
是否等换了新证再启动会比较好？-Yes.