翻译...where I only have 8 weeks, I don't think I could of made it a whole 12.

the gist of this paragraph:只剩下8个星期了,我不认为我可以在这12个星期内完成.
"Could of" is wrong,it does not exist.It is,however,easy to mix up "could have" and "could of",since it is normally pronounced in a slurred way and then it sounds like "could of".
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Could Of or Could Have?
Could of does not exist.Neither do should of,will of,or would of as verbs.
Write could have,should have,will have,or would have.
If you want to emphasize the pronunciation,write it as a verb contraction:could've,should've,will've,or would've.
anyhoo,hope it would help you learn sth.
FYI：you got any question,pls feel free to ask me.