He is saying "Moshi dokkai ga nakattara", meaning "Except for reading comprehension (category)", I would be a Good at Japanese Literature Guy.
The test categories in Japanese are Chinese Literature, Classical Japanese and Modern Japanese including Kanji characters, reading comprehension, etc.
Yuzuru may not be good at reading comprehension of modern Japanese? :think:
Maybe comparing to other categories, I think. At least, better than me
Oh, I see my silly mistake! So careless, thank you SuzyQ! :
I can't imagine how hard Chinese Literature would be, I already struggle with normal Japanese kanji (as seen here!).