So since premium levels don't work (At least as what I think so as from what I've seen), essentially getting 62 stars is harder to do.
In order to do that, you need to get 3 stars on every level (Excluding premium levels), complete all the non premium levels in heroic and iron, and click the facebook and twitter buttons (Gives two stars, once for each site) when it tells you to like them on those two sites (You don't actually have to like them on either site to get the two stars).
I already did the math on how many stars heroic and iron give for each non premium level and how many stars facebook and twitter give, as well as all the 3 (None heroic or iron mode) stars for the non premium levels, and it adds up to 62 stars.