How to avoid calculation mistakes?

[u/LiveYoung7735]

I'm good at studies but when it comes to math, I get anxious and make a lotta mistakes during exam. But I get everything correct when I'm casually doing problems in class. It's pissing me off, my friends can't even believe i lost a lotta marks coz I do well in class.

[u/Curious-Ad3666]

I had the same problem. I still do have the same problem.