GPA requirement for OPT application

[cool_hunk]

I am an International Graduate Student in Computer Science and applied for OPT in November which is under processing. But in my last semester, my overall gpa is 2.96 which is less than the required gpa for OPT and my university requirement to graduate . And I also applied for my grad walk which is tomorrow and last date of study in my i20 is December 10 2015 i.e tomorrow.So, what is the best option for me

1) cancel OPT and continue as F1 Student this semester and apply a new OPT
2) continue as pre-OPT with course work and part time employment i.e 20hrs/week.Does these effect opt stem extension ??

Are there any other options available for me let me know.Please its very urgent.