what will i do that i fail exams?

Don't worry about it. You've studied hard and have taken the exams, it's over so don't worry. Since you've studied your marks were probably good but even if they weren't, there's no use worrying about it. I'm sure you did fine. I always stress out about exam scores (even though I know I shouldn't) and it turns out fine.

Failing in class or whatever fields in life is painful. But not necessarily bad. Remember failure is the steps to success. Today you failed but if you take lesson from it, think and think again then you will find the reason why you failed and what went wrong. Taking lessons from these you'll do much better in the next exam. So don't be depressed whatever happened you can't change but you can change the future. Best of luck!

I've also experienced failing when I was young. I regretted it a lot because it was my own fault that I failed. I know that I could have done better but I didn't. If you know that you did your best then don't feel so bad. You'll just have to try harder next time. It's not the end of the world yet. Maybe you just need to figure out what you did wrong and try to correct it so that next time you won't fail again.

there are many exams in our whole life.some are not in class and on paper.i don't think it's a big problem .because you have tried your best.i think you will make progress when you have more skills and accumulate more mathods and experiences.