Broken calculator

Hi, I dunno if anybody here can help but I really hope so.

I dropped my scientific calculator on the ground (I've had it for like 5 years) and now it has a massive black line going down the screen and when I enter in values it doesn't do it from the start . IM SOO ANNOYED AT MYSELF AS I HAVE A MATHS GCSE IN 2 WEEKS AND THE MODEL OF MY CALCATOR IS NO LONGER MANUFACTURED. I'm probably overreacting but I've had this mod for so long, I genuinely can't deal with learning the set up of another one 😭😭😭

If anyone knows how I can fix it or where I can get an (old version) fx-83GT PLUS casino calculator, I'd really appreciate it