Drop 1 archer near the wall to check if there is any castle clan troops. If yes, drop 1 more archer near the corner to attract the CC troops. Then 1 more at the corner before you drop a ring of archers around the CC troops to kill them.
Drop all your giants to the closest air defense rocket.
Drop all wall breakers behind giants
Drop all wizards behind giants to cover them. If you have Clan Castle troops, drop them behind your wizards.
Drop healing potion if your giants health drop or when necessary
After air defense rocket is destroyed, drop healer near giants
Drop archers to cover giants and wizard
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Timing is important in this strategy. Don't let your giants attacking without wizards covering them. And don't let your wizard attacking without archers covering them. I use this strategy for war and most of the time I got 2 or 3 stars. You can also use this strategy to attack TH7 base, provided the base you're attacking is still not fully upgraded. Good Luck!