For the Swamp Shooting Gallery, make sure you ALWAYS get the Wolfos as soon as possible, as they don't come back. Other than that, just try your hardest and make sure you get the hidden Deku Scrubs. As for the Town Shooting Gallery, memorize the locations of the Octoroks, especially the one with five because that is the tough one; also do whatever you can to not hit the Blue Octoroks. The town one is the tough one, so don't be surprised if you take 50 tries to get it.