All the other students already know magic and get stronger, he can only copypaste a spell at a time.
He will always be at a disadvantage.
He can't just simply 'powerup' and gain stronger magic then them (in generic shounen they just get a sudden powerup and everything works fine).
The only advantage he has is having limited access to all kinds of magic, while most people specialize in a certain school (strenghteing, illusion, curses, physical effects or straight up attacks etc)
That's far from generic (I can't actually remember a series that uses a similar setup or perhaps I just haven't read it)