A supervisor recommended Mateen be kicked out of that class, calling his behaviour "at best extremely disturbing."
School records reveal Mateen's behaviour problems began as early as the third grade, where he would talk about sex and violence.
He was suspended a total of 48 days before graduating high school.
Prior to the Orlando shooting, an official told CBS News, Mateen was active on dating sites, searching for both men and women.
Watch: Investigation uncovers more about Orlando shooter's erratic behaviours
One woman is coming forward, telling CBS News correspondent David Begnaud that Mateen stalked her after meeting her at a courthouse.
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