They can beg all they want, education is a service, as is medical attention. Goods and services provided individuals aren't a right, they're an individual good / service. At least in the U.S. there is a Constitution and Bill of Rights, education isn't listed in either from my readings of them, if you find otherwise, please correct my error.
If you want to change the conversation to what is reasonable to expect of education as return on taxes intended to support public education, I'm happy to discuss that as a separate matter, however, education is most certainly not a right.