I believe the key to successful studying for an INFP is studying topics you are passionate about. I was an extremely average student in high School. (I didn’t get into a 4 year university initially. I went the junior college route first). I also struggled through the majority of my generals the first couple of years. Once I found what I loved and wanted to study (History and Psychology), studying on an undergraduate level was a breeze.
For me, ease or difficulty of studying is dependent on the type of work that is required. Again, if it is something that fascinates me, I remember and understand details, concepts, and patters without effort. I am fascinated by topics that relate to humanity. No matter how complex the subject matter is (economics, for example), if it relates to humanity I am on board and facts and details are absorbed almost effortlessly. Dry topics such as chemistry, physics, or accounting, it’s a struggle studying I never quite figured out.
Understanding your particular preference for acquiring information will be helpful. I tend to work in bursts of creative energy. These moments happen when I have been thinking about something over a period of days. I think about the implications, possibilities, and patterns of the topic at hand. Then, at some point, everything clicks and I produce a ton in a short amount of time. If this doesn’t happen, I can force it to some degree when the deadline was close. I typically wait until the last minute to complete something anyway. Not because I am lazy or consciously put it off, but because I am processing it on a global scale to make sense of it in comparison to all the other information/values already in my head. I think we tend to get down on ourselves for sitting down to study and not being able to focus on a single subject in an allotted time. You can’t think of it like that. I call it brainstorm studying. I would crack open a book/notes with the intention of “producing” only to get distracted with thoughts of other subjects as well. I learned that this was an essential part of crystallizing information for me. So school work was a process of 75% “brainstorm studying” and 25% intense production.