To say "going to school" in Engpsh, you can say "going to school" or "heading to school." To say "leaving school," you can say "leaving school" or "departing from school."

Here are some examples of how you can write these phrases:

"I'm going to school now."
"We're heading to school early today."
"It's time to leave school."
"I'll be departing from school at 3:00 PM."