In college I used a Slax (version 6 IIRC) SD card for schoolwork. I did my work across various junk laptops, a gaming PC, and lab computers, so it gave me consistency across all of those.

Booting a dedicated, tiny OS with no distractions helped me focus. Plus since the home directory was a FAT32 partition, I could access all my files on any machine without having to boot. A feature I used a lot when printing assignments at the library.