I'm not sure if this happens to everyone, but when I'm able to solve a problem in a contest (generally C in Div2) that was supposed to be a little challenging for coders rated like me in a very short time, I get a little too excited and lose focus, which causes me to repeatedly fail to solve Problem D's in Div2 Contest, despite the fact that I can solve them relatively very easily off-contest.

Is there a way to get past this, or I'll have to learn it with practice?

(road to expert)