translation mistakes
On my assignment I wrote this sentence "Tomé dos clases de español con el profesor Brown". My profesor underlined " Tomé dos clases de español" that I need to correct it. i meant that sentences that I took two clases from Dr. Brown. So far I couldn't figure out what 's wrong with that part.
3 Answers
"Tomé dos clases de español con el profesor Brown"
In Spanish the use of tomar for taking a class is actually an anglosized way to say asistir and in fact is not even listed as a usage in the RAE dictionary. My guess is that your professor wants: Asistí a dos clases ......
If it´s a matter of tense, you need to be given more context.
Well, I don't see anyone else jumping on this, so I'll stick my neck out and say it looks OK to me.
Maybe he wanted the present perfect "He tomado" No sé. Like rac1 said, ask the professor what's wrong.

I don't think it's a matter of tense choice. (Saying he tomado shouldn't not be considered as it's sounds better than tomé ) I think the teacher wanted a more idiomatic way to phrase the utterance.
Although, tomé is quite used when it comes to speaking about subjects.