As a pakeha New Zealand, I take pride in knowing a little te reo, using everyday greetings and farewells, counting in Maori numbers, using some of the colour words. I've never studied te reo formally, but I've paid attention, and picked up a fair number of words here and there. But I've got a long way to go, especially with respect to grammar, and even just with using some of the longer and more formal greetings and farewells.
The Dominion-Post has a "Te reo quiz". It's not really a te reo quiz: it's more a vocabulary test. Even so, go test yourself.
Update: In comments, anjum has pointed to a site where you can sign up to get a word a day in Te reo. The site is here: He Kupu o te Rā. You can get the word-a-day via e-mail, or via your RSS reader.