Well, i didn't found Europe as hard as you CrAzYeDdY, but i will try to help. My main advice is to send airlifts to your teammate, not yourself, I usually put first one into Scandinavia - it help to protect England and AI starts to gain parts of cards since then too, which helps to beat lvl faster. I suggest to put your first main assault into southern France, where you will meet big army (around 100). Every turn try to attack each 1 with your 2 army, deploy new troops in whole wide of front line. It help to break quicker and lower Germans income.