Am I Doomed? Mat 126 and Eng 130

I've been browsing around on this sub and it sounds like mat 126 has more writing required than the English class and seems like it's a bit tough. I've been considering dropping down to PT anyways but I was going to try to go one more term FT since it's only my first term here, but I'm struggling to find time to work on the projects I have now. I'm supposed to take both of these classes together next term and already ordered my books. Does anyone know if my book codes will still be good in the following term if I call my advisor and beg them to drop me down to PT?