While I have completed all the N4 recommended Renshuu schedules, it seems the Pre-Intermediate Japanese schedule can't reach 100%, although I have reached it for previous schedules and usually fixed by uncovering hidden terms or modifying study method for short terms... The situation is the following, I have just reviews going on on daily basis, no more terms to study in the schedule, but still can't complete it.
Did you clear out all the vocabulary too? You seem to not have every word in your "kotoba N5-N4" schedule cleared, and the percentage thingy looks at your overall knowledge, not specific from a schedule, for example I never studied any kanji schedule for N2 but I still know some of those kanji because of other lists (I wasn't sure how to explain the last thing correctly, so sorry for my crappy explanation)