That seems an odd progression. I used 5.25" floppy disks from grade 3 to grade 6, when I switched to 3.5" floppies. DVD came around my final years of school in the mid 90s and USB flash drives didn’t become widespread until the early 2000s, when I was already at uni. I remember Star Wars Dark Forces being the first game I got for my first DVD drive and that came out in 1995. I got a DVDR the next year with money we stole from the school. Me and two friends shared one DVDR because they were still so expensive.