Yeah its like these guys said. You do technically start as an academy student, but this part is the very first section, where you are taught basic jutsu, movement, taijutsu, etc. Essentially the base for everything. Once you have completed all these sections, you will be awarded with a headband, and become a genin, where you can narrow down and improve the particular skills you want. The reason we decided to do this is because as mentioned, it would be very hard to organize exams(written) and because most of the typically 'fun' things actually start when u become a genin(questing, your own team and mentor, advanced training etc).
Oh and as a side note, book learning will certainly be available. In fact, those dedicated enough to find books/scrolls on different subjects, either from a library or scattered throughout the world will gain a significant advantage in combat and general skill improvement. As well as this, guides and maps to find forbidden and poweful jutsu scrolls have also been discussed to be hidden both in obscure locations and the larger and more ancient library's throughout the world.
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