Any one here figured out how to do 4a? I am trying to figure this one out, although I don't even know if I did the other parts right (even with that guy's help, I don't trust myself.).

At this point I'll take any suggestions that might help. Even links to other, hopefully easier, haskell textbooks might help.

Did you figure out how to approach the problem?
I was able to read the file into a String, then split the String into a [String] where every item in the [String] is all the info of a single student. I'm currently trying to make a function that takes a [String] and returns a [Students] but I'm not sure if this is the correct approach since I'm in a locked on how to execute it.

I was able to read the file using "readFile". "putStrLn" should output the contents one line at a time. ie

" John, Smith, Comp Sci, 24 "

"Jack, Daniels, History, 29 " 

I'm stuck here. I know I need to write a function that takes this data and turns it into a list of students. 

So I was able to think of a viable solution. 
I read the file, create a function that takes a String and returns a [String] that recursively iterates the String and stores a chuck of the String each time a Char in the String == "/n". This will give you an [String] in which each item is a line of the original String, then do the same with the comas, make a function that takes a [String] and returns a [[String]] that iterates the list and each item then store a word when a Char in the String =="," This will give you a [[String]] in which each List in the List is the info of each Student, then make a function that takes a [[String]] and returns a [Student]
(I know its not the best solution, but is the only one I was able to come up with)

For the function that splits Strings, I used the words function on Prelude as example. (https://www.haskell.org/onlinereport/standard-prelude.html)  replacing the Bool result of "Char.isSpace" with the (==",") or (=="/n")