'一次读很少的书' means ‘don't read many books at one time' or 'not much at one time' Don't urge yourself to read too much or too fast , suggest you finish a book that needs some patience and to be continuous till end .

Literally it's a bit confusing without any further context. 一次读很少的书 might mean either 'reading a few pages of a book' or 'readig a few books in one sitting' or something else... I think 一次(每次)读很少（种类）的书 is probably the message that the author wants to convey, which means ' only pick up your favorite types of books to read instead of reading anything without selecting it.

Do you get the answer? according my thoughts, former part says reading more books, so latter part should be small books. Not thick books. And Chinese character 小 seems accurate. I am not sure yet as a Chinese I confuse 小and 少 too。小 conveys size 少 conveys quantity. Pls others correct me if I am wrong.

I have checked the context of that sentence. My personal view is the speaker didn't make her meaning very clear. But from the context we can now she meant when you read, read carfully, you will never be able to read all the book, but only when you read good book, and read carfully and foocus, you can get benefit. also the right way to say " A and B are different" is " A 和B 不一样。“

first of all, the sentence '一次读很少的书' is quite misleading. and not a correct sentence at all. second, it just simply means to read each book carefully.