This is just from experience, so don't take it as a definitive answer ok?
During 6th year I was going to be doing volunteer work coaching football in Kenya, I got through all the tests and all that. However, these were through school, there *may* have been more thorough examinations etc afterwards, I never got that far because I chose to call it off.
Good luck, it's an amazing experience from what I've heard :)
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