Warning: if your foe has a level 7 or higher town hall, you must beware of hidden teslas.
first In order to crank out some extra points ahead of time, start the battle by placing barbarians or goblins at the corner.
search and split giants across everything doing splash damage. This will keep them from taking out a chunk of your army at first shot. Giants should also be paired up with barbarians at a rate of 3:1 or 4:1 (B:G).
as soon as those weapon types disappear, quickly place the archers. Barbarians will scatter and destroy building while newly placed archers and giants target remaining weapons.
Once done,nearly every troop will try to break the town hall. The goblins placed at the beginning should be done by now.