It really depends upon which school u r attending. I am able to take full time CPT (40hrs/week) during spring and fall.However, 1 of my friend told me that his school doesn;t allow to take full time CPT during long semesters. Likewsie, some schools don;t let students take full time CPT during back to back semesters

You can do CPT more than 12 months , the only thing is the additional time (>13 months) will be deducted from your OPT time. I suppose this won;t harm you.Looks like you are a STEM student. First check if they use e-verify or not.

Make sure you tell the employer that u can accept position as CPT. They will be happy to do it. Because they will pay u less and won;t give you any company benefits.

Finally, your 6 months part time CPT doesn't count towards 13 months CPT ( I beleive it;s 13 months not 12).

I hope this helps u.