I just finished my OPT and had applied for two graduate schools. I got the acceptance letter from school A and before my OPT expired, I transferred my SEVIS to that school, but it is dated on 24th of April. Now just two days ago I received the acceptance letter from school B. I want to go to school B and want to transfer my SEVIS there from school A. School A has not yet issued I20 because SEVIS is dated to transfer only on 24th of April.