Select a level that's easy to earn a medal in and play the level repeatedly until you get gold. For example, to get an easy "Preserver Of The Infantry Medal", win the first level without losing any infantry.
After giving attack orders, there is a button with a "faster" function. Select it and it will become blank while the CPU movement icreases. Tap the blank again and while you are attacking, the button will remain highlighted.
When playing in campaign mode, surrender. Afterward, play it again. Now surrender and play again one more time to have all reinforcements ready. This works in every level in Campaign mode.
