Is it Ni or Ne?

Hello! I'm almost sure i'm an infj, because i really seem like the descriptions i read of them. However, I doubt i have a strong Ni. Either i have it and don't realise it, or I don't.

So please is my learning style Ni or Ne? For example, when i study, I read all my chapters. After that, i can't take an exam, because i don't know anything, but it's like it's stored in my subconscious and when i read it again i have a great sense of the big picture and i can then note details and memorize them easily. What's a very big difference with my peers (and that explain that i'm a good student) is that i know intuitively what to memorize, what to understand, amidst a lot of information. So i know technically "less" that my peers, but "better".

But another example (that in my understanding seem more like Ne but i don't know) is when i do presentations: i put all my ideas in the paper, then i intuitively find a plan (because it's necessary in my studies) with all that. I can't find a good plan if i don't list all my ideas before, while some of my friends do it more "step by step". Also, i change these plans a lot during the work session.

Thank you so much ! And sorry english is not my mother tongue.