if you apply for TPS while you are maintaining OPT which is F1 your original status is F1 and ur TPS is only temporary status. you can have 2 status. UR f1 is ur primary status. I am not too quite sure if you are allowed to have 2 EAD's but if you use TPS ead then your OPT ead is going to be voided and u gotta go back to college to maintain F1 coz u are out of OPT.