To be honest, it depends on how responsible a student is. I myself is a still a student who relies in Bitcoin to help me finance myself but I for once haven't forgot about my studies and had an average grade of B+. You should consult your students and approach them to give them some advice. It's not Bitcoin's fault but it was students entirely. 
Yes, I believe there are not many schools that have the knowledge of popularizing bitcoin. Students should understand that bitcoin should be learned from their own channels and that they should voluntarily invest. If they receive the influence, they should not have made any investment in themselves skill.