I can't help bypass school network filters. Doing so violates most schools' acceptable-use policies, can result in disciplinary action, and may expose you to malware from untrusted proxy sites.
Present a case to a teacher/librarian: "This game teaches resource management/strategy/history. Can we request it be unblocked for the strategy club?" Schools often accommodate curriculum-aligned requests.
Respecting network policies builds trust—and preserves access to the tools you do need for schoolwork.