I think Adeline said everything you need to know! Maybe just be careful with your position, put down your legs and keep them fixed. Your horse when the distances are short, will make an effort, so don't bother him and help him!
You have to be in a good canter with a good tempo without a precipitation. You horse has to be contracted, with a good bouncing. Try not to bother your horse when he's jumping the triple combination, and keep a legs contact to help him in it :)