How do I count all the files at different subfolder using for loop

I want to know could I wc -l files are in subfolder.If only one file I can use code like below.

find ./calss{1..20}/ -name 'C1.student' | xargs wc -l

In fact, I have 20 folders , every folder contain C1.student to C50.student files.I want to use

to count multiple files at different sub folders. I try this code but got all 0, Did I miss something ? Thanks for your time.

for i in $(seq 1 50); do
find ./calss{1..20}/ -name 'C${i}.student' | xargs wc -l
done