All symptoms of Steven-Johnson syndrome. As the statistic shows, Ab was lucky to survive, but look at him now.
“It’s still bright as fuck” — Because his eyes have been shut for so long, they have become very sensitive. Light is “bright as fuck”.
This also explains why Ab so rarely is seen without shades
Suggestions
She didn’t help him with school, he copied her. That’s why if she didn’t graduate, he wouldn’t either, because all of his answers were her.