This guide is aimed at any TH7 who is looking to push to Masters and get the achievement and 1,000 gems.
To help, AaroNero made a series of YouTube videos, the series starts with Hogs and moves to Dragon attacks. At the end it even shows how to 2 star rushed TH10 with Inferno Towers. Watch and hopefully you will get some tips on how to easily reach Masters.
Check out a couple of videos here, then check out his YouTube Channel for the remainder of the series.