Glycine is a nice stuff. But i never felt any effects. In fact you can eat a tons of glycine, looks like nothing happens, but doctors said it is good for brains.
There are other nootropics like Phenibut, Piracetam and so on. These drugs can reduce anxiety, increse learning and memorization abilities and so on.
Also there are class of drugs called anxiolytics. For example Afobazole.
Not sure if you are able to study when you'll use peony or something sedative. You could just fall asleep =)

As for me, I like Phenibut. When "all hands on deck" situation happened at work, it was very good - one pill and i just do my job and don't give a duck what's going on around me.