To earn it FOR a yeshiva bochur? Or for a yeshiva bochur to earn it?
You prob mean the 2nd one,so…
1.clean cars/vans for Pesach
2.pick up Shaimos from homes
3.offer to deliver/pick up matzos and wine
4.fix broken dining room chairs/go thru seforim shranks,clean the seforim
…jobs that a person with little help/manpower is willing to pay others to do.