The theft and corruption you describe run deep, and the pain among the teachers is real. When Ecclesiastes calls the world apart from God a chasing after wind, it exposes exactly this kind of greed. A person can pile up stolen gain for ten years or a lifetime, and it remains empty vanity before the Lord. The heart of the problem is not ultimately the missing benefits but the lust and greed that devour a soul and wound everyone nearby. Scripture warns repeatedly about those who run greedily after the error of Balaam, using position for personal profit while the flock suffers. Your cry to the Father is right, and He is not indifferent to what has been taken.
In desperate days like these, God often waits until His people are truly desperate before Him. All through the Scriptures, when His children reached the end of themselves and sought Him with their whole heart, He answered in ways that displayed His power. Daniel understood by the scrolls that the desolation of Jerusalem would last seventy years, and he set his face toward the Lord with prayer and fasting. The deeper the darkness, the more earnestly we must press into the only One who judges righteously. Keep bringing this before the throne, not with a heart of bitterness, but with a heart that trusts the righteous Judge. Bitterness itself is the way of Cain, a corruption that can eat at your own soul even while you wait for justice.
Remember that the teachers around you are watching your response. When Paul wrote that we should let no corrupt communication come out of our mouths but only what builds up, he was giving a principle for times of trial. You work in a place where many are deeply sad, and your words can either add to the tearing down or begin the slow work of building up. The purpose of any believer in that school is not merely to escape the situation but to be a presence of truth and maturity right in the middle of it. The fruit of the Spirit is love, joy, and peace, and that fruit grows even when the surrounding soil seems poisoned. Do not let the wrong done by another become an excuse for your own soul to shrink into resentment. The Holy Spirit seals you for the day of redemption, and that seal remains regardless of what an earthly administrator steals.
False teachers and corrupt leaders have always been with us, and Peter and Jude describe them with remarkable clarity: they are like raging waves foaming out their own shame, promising much and delivering nothing of lasting worth. But the vengeance belongs to God, not to us. The fire that fell on Sodom was His doing, not the act of Lot. So pray without selfish motive. Ask for the removal of this person, yes, but even more, ask that your own heart would remain pure before the Lord, and that the entire school would see a witness of His righteousness shining through those who trust Him. The same God who stirred the spirit of Cyrus to restore what had been lost is able to act in ways you cannot predict.
When the bride in the Song of Songs looks out and asks, "Who is she that looks forth as the morning?" the answer is a people purified through affliction, their love for the King undimmed by the corruption around them. The chariot of the bridegroom was paved with love for the daughters of Jerusalem, and that love ultimately triumphs. The morning is coming, a day of righteousness and peace and blessing, and every hidden thing will be brought into the light. Until then, you stand in the midst of the darkness, not to curse the darkness, but to bear witness that the dawn is sure. Keep praying. Keep your tongue from corrupt speech. And trust the Lord of hosts, who hears the cries of the desperate and will not be mocked forever.