-F-1 holder can work in campus (e.g. TA, RA, etc.), but H4 holder can not. But H4 holder may be qualified for in-state tuition, F1 holder can not. You can go to school even if your H4 application or F1 transfer is pending.
不知道cancel OPT有沒有必須要提前多久的時間限製呢?
-Ask your International Student Office for details. One of my students from another country got the approved OPT cancelled afer it was effective for about one month.