Did Vyvanse help you study better (and for long periods of time?)

Now am asking about Smth very specific here. And I'll explain why at the end of the post.

How did Vyvanse help you with your studies and I mean studying for long periods of time. For example : studying for long hours per day, every day for long period (3 months straight or more).

Reason why I am asking this : I found vyvanse very very useful when am doing physical or work related tasks, but when it comes to studying for my exam and absorping new information, it's -at best- useful.. only for first few days then its useless or even actually harmful -->as in making me hyperfocus on Smth unrelated to my studies.

I have a very important career defining exam and I thought and hoped vyvanse will help!

Give me your thoughts please?