Question: is it taken or tooken?
Answer: “ “Tooken” is a non-standard form of “taken.” In fact, there are two past-tense forms of “take” which shouldn't be mixed up with each other. For the simple past you need “took”: “Beau took a course in acoustics.” But if a helping verb precedes it, the word you need is “taken”: “he has taken some other courses too.”