recommend you to ...

I would write it like this:

I'd recommend that you study more if you want to pass.

Neither article, "to" or "that", is necessary. "I recommend you study ..." would be the more grammatically and stylistically correct rendition.

But only west of the Atlantic! For a generation or so it has been acceptable in American English to drop "that" in such a sentence, but in Britain it still grates on the ears of traditionalists, in formal writing at least.

I'm quite west of the Atlantic, and to my ear, Phoenix32890 got it right.