1000% they are being poisoned, there are countless videos of the mullahs saying that schools and universities are "more dangerous to us than a bomb". This is a pattern that the Taliban used between 2010-12 to close girls schools and distance them from their education, leading to total isolation from any education at all, which is happening now, as you probably know. Also in Iran since the protests, we have seen university students poisoned en masse, to stop their protests and weaken the force they were gathering in voicing their dissent against the totalitarian regime. The following days they threw their refectory meal trays into the courtyards, untouched and had mass shared picnics of their own home food outside in the campus to show their resistance. These things are common tactics by this regime.
It seems far fetched, but in the past even in the UK the government tested germ warfare in Oxford street during the cold war! The files are public knowledge now here is The Independent reporting on it. And it was not only UK. USA tested chemicals on black people by injecting them and lying as to what it was, in Louisiana, Tuscany. Historically, the term "hysteria" has been used to put women down and devalue their protests. In Victorian England doctors and husbands routinely forced women to have their wombs removed as they were believed to be the source of their over-passionate "hysteria", hence the medical term "hysterectomy". They also used to pull ALL their teeth out for being difficult as it was believed to placate them, or put them in mental homes for having kids outside of marriage.
So you see it is not far fetched. As far as the things The Islamic(ist, as we should really be calling them) Regime do to surpress the people and maintain their mafia-like control, I will not horrify you with the details, just believe me, this is nothing. The Islamicist Regime hates women, hates schoolgirls (see the videos of school girls rebelling their bring tears to the eyes! They have had enough and risk everything!) and hates minorities, they regularly make people chant nonsensical things such as "Death To America!", yet take no criticism themselves. Look up the hashtags #womanlifefreedom #jinjiyanazadi #mahsaamini #opiran and #iranrevolution to see more.