We all know there are uncertainties everywhere. But you should not bother this kind of thoughts at this moment. See the only logical thing in this moment of time is to study. Leave the fear behind and move on. It can feel like theory but its a basic reality of life. Lets discuss an analogy. You want to go to a shop by cycling. Now if you think that you can't reach the shop on time as you cycle may get punctured and as a result you don't go for the shop and take rest at home. But if you have left the house and start going for the shop then you would have reached atleast you have possibilities.
Thus we all are living on the possibilities and you should not freak out just thinking you don't want to fail. If you don't study for your exam then you will definitely fail but if you study you will have possibilities to get successful. So lets overcome this fear and do it.
Some tips:
You have to do it because you want to do it. So be courageous and beat the game. You can do it!
I hope this answer helps. All the very best for your future endeavors!
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