[jonramz]

You cannot do both 12 months of pre-completion and 12 months of post-completion OPT, you only get 12 months of OPT per degree level

[winter_blue]

Yes, you're right. So if the OP works for 3 months this summer, he can still do 9 months of post-completion + 17 months if he has a STEM degree.

[jonramz]

can only do STEM is he works for an e-verified company, STEM is tougher to get for people running their own business