I study for again??

Dear teachers,

I was reading a book and came across this sentence:

…I study my books till dinner. After Isha prayers, I study for again. At about 9:30 I go to sleep.

I don’t know the meaning of “study for”.

Please help.

Many thanks in advance!

It’s a typo or error in the original.
It doesn’t make sense and should say something like “I study for a while again” (I study them again for a certain length of time).

Thanks - Beeesneees