The Kotlin Programming Language.
I can't really help with your school setup as I know nothing at all about it but you can try it out at https://kotlinlang.org/ which should get you far enough along to understand what's going on.
NOTE: The number of mentions on this list indicates mentions on common posts plus user suggested alternatives. Hence, a higher number means a more popular project.
Kotlin 1.7.0-RC is out
1 project | reddit.com/r/Kotlin | 20 May 2022
Why is there no cbrt function in kotlin.math?
1 project | reddit.com/r/Kotlin | 11 May 2022
CitRep - Android + Appwrite - Hackathon
2 projects | dev.to | 10 May 2022
What's new in Kotlin 1.6.21
1 project | reddit.com/r/Kotlin | 19 Apr 2022
It’s amazing the stuff you can code nowadays
1 project | reddit.com/r/ProgrammerHumor | 12 Apr 2022