@Suben ah so technically he could still run it back for his third year, though sometimes third years āretireā to concentrate on exams. But all the baseball manga I read third years do still go for one final run at koshien, maybe Kenta will go for it.
@livesofflight I'm going back to try and look at the timeline. The series starts in winter and chapter 4 shows that Kiyo and Suu-chan left in winter of the previous year (since it's labelled "1 Year Ago") while they all would've been in their last term of middle school. So by the time the series starts 1 year has passed putting Kenta in the third term of his 1st year of high school while the current chapters take place in summer. The Japanese school year ends in late March and starts in early April. So Kenta should be in the first term of his second year of high school (since Koshien qualifying tournaments are in June/July).
And yeah Koshien is one of those things that's so important that it likely overrides worrying about exams at least for that first term so undoubtedly he'll try again next year.