I know what you mean, but I will never speak that to my friend, because it sounds too formal. If I want to encourage my friend before exams, I will say "别担心，会过的" , or "没事儿，挂不了"！"过" means "通过", to pass; "挂" means "挂科", to fail in the exam.

是的,這句話有激勵人心的作用:) 另外你也可以說,"你可以做的到的" = you can do it

Suitable. If you want to be more casual, you can say: "加油，你可以的！" You can make it.

exactly!!!! or you can say "相信自己，胜利终将属于我！"

如果你想显得正式些可以说：祝你成功！祝你顺利通过！