That is a very unusual combination. Do/does appears very rarely in questions that begin with a question word, in this case "who". Whether it's used or not, depends on the verb. "To study" prefers to go without "do(es)". This is why the "study" in your sentence doesn’t sound like a verb but like an object, as in "Who does the cooking tonight?". And "to do study" is not an English phrase, as far as I know. :)
Latin pronunciations is a real problem in Duo, mostly fanny , inaccettabile here. I think that the speakers do not have even the right conformation of the mouth to pronounce latin. I am italian and studied latin for 8 years like everybody frequenting lyceum at the time, but there is not need of that, every italian can pronounce latin properly. May be the same people involved in pronunciation in the italian course... Like now is not possible.