Affiliate Marketing Secrets

I work with non-profits as a vendor supplying tutors, and have observed that most grant money comes from either the 21st Century Grant or the No Child Left Behind Act. It seems that the 21st century is fairly flexible in it’s requirements for tutors, where as the NCLB has very tight regulations, requiring that tutors be affiliated with an SES (Supplemental Education Servicer).
How are these two sources of funds related, and what are the relevant differences and similarities?
Best,
M