Approach - Yardage Bank
Under pressure learn to have control over your distances when approaching.
Approach play is one of the most important parts of golf so learning to be able to control your distances is going to have a huge impact on your scoring.
Learn how to control that golf ball with confidence even if you have to feel a 75% swing with more club. Most amateurs play for their maximum output even with irons without realising that, yes they may hit an 8 iron 150 yards sometimes (2/10 times), if they swing easy with a 7 iron they may find they do it more often (7/10 times). Therefore learn to play sensibly to improve your scoring.
Learn your real yardages and feel, opposed to vanity yardages.