This may seem silly of me to introduce to you an app that on it’s face, seem like a children’s game. Well it is, but it may help you.
Planes Control is a free “arcade” style game, where you need to draw a path for the various aircraft that fly inbound for landing. All aircraft fly at the same altitude so you’re only provided horizontal separation. You’re graded based on the amount of landings that are completed. Aircraft will come in faster and in higher volume as you progress. Each level gets harder and harder with terrain, obstacles, and different runway configurations.
It’s very fun, will test your ability to manage tasks, and test your speed. Managing tasks, conflict resolution and speed is a very important skill to have as a local or radar controller, but especially a radar controller. Give it a try and beat my high score so far.