Mental Game

Hi, just looking for anyone's advice on this!

From what I've seen, people who perform extremely well on the day seem to be very concentrated, and have the ability to stay completely focused, not freaking out over anything.

I've seen this result in people getting 100-200+ from their mock scores, so anyone that could share how they stay focused and don't freak out in the actual exam, it would be very helpful!

p.s. I just got 2240 in Mock D today, and I know everyone claims it is easier but is it realistic I get 2100+ on the day? Thanks!!