Is going to verify the guardian's data, status, and living conditions to ascertain his eligibility for a tuition fee reduction considered espionage?

There is no harm in verifying the truthfulness of those who claim to be in need of assistance, because this is a permissible verification to prevent deceivers from tricking those who wish to help the needy. Umar (may Allah be pleased with him) said: "I am not a deceiver, nor can a deceiver deceive me."