AH 10: Impact of Joining Day 1 CPT Colleeg After OPT and STEM OPT

Hi! I’m currently working on OPT (10th month) and I have to apply for STEM OPT Extension this January! But I failed in my comprehensive exam and I will lose my F1 status because I cannot get my degree. I have been studying in this college since August 2014. Now, I’m planning to apply for Day 1 CPT college! So I was wondering if I could apply for 24 months CPT college after using OPT? What are my limitations and what are the chances that I will be approved for CPT after OPT? I’m working on the same field I studied in my masters!