It looks very much like there were suicides as a consequence of a poor mental health system in the country. There's no logical reason to kill yourself for having to redo an exam. These cases nearly always have something far more significant going on mentally.
You realize a lot of these countries have the One Big Test(tm) that literally decides your fate, right? Basically at the end of your high school education, you take One Big Test and it determines your future. Do really well and you often get a full ride scholarship to an overseas university (basically any university you want to get to - UK, US, Canada, etc). Do well and you get a scholarship to a local university. Do OK and you might be able to get into university if you can pay for it. Do badly and it's either trades or that's it, you're a poor laborer.
It's often so big many of the countries demand complete silence while the exam happens - they will cut back traffic, cut internet access, stop flights, etc.
And yes, these countries have a LOT of teenage suicides. Many students succumb to the pressure - not just the pressure to do well, but pressure from family. In fact, many students have been known to be disowned by their family for not doing as well as they were expected to. (I.e., if you were expected to get the full overseas scholarship and only get local university scholarship).
Students will spend 18 hours a day being tutored and studying for the exam - literally all day and all night in the leadup.
It's one of the advantages of the American system - in that you get second chances. If you fail your university entrance exam, you can often take it again, usually the next year. Same with basically any critical exam - fail the bar, you can take it again the next time (6 months later, though). It's not consequence free - you have to wait for the next exam to be held, and you lose any time opportunities like jobs and such that might be waiting on successful completion. But you get second chances, because at least we've recognized that things happen. You might do poorly because a family member passed at an inopportune moment.
Many of those suicides happened because they put their work into studying for the exam - literally put their life on hold for a month or more and many cannot contemplate having to go through it all over again.