Liza Jane B. answered 03/24/19
Lover of writing and teaching people how to write!
It's hard to say if this is a fluency problem, since everybody has different reading skills (especially those who speak more than one language), but if it is allow me to offer this advice. Start by reading shorter, simpler books. They can be in any genre, about any subject that you like. As you finish each book, the next one you read should be a bit longer and a bit tougher. This will condition your brain to be able to absorb longer and heavier books.
Another thing you could do, which I do myself, is to highlight/underline/take notes while you're reading. This will keep you brain actively absorbing information as you continue to read and you'll have notes to look back on in the future! This exercise also helps your memory take in this kind of information.
The important thing to remember is to go at your own pace! And please don't be discouraged from reading deep books just because you are a sophomore! If you love reading these books and want to keep learning new things then nothing should stop you from doing just that!
Hope this helps!