Re: Problem student!!
1. Do not offer suggestions to him, you'll just get frustrated. It is his problem to understand, nobody else's. If you learn to accept that some people are not open to suggestions or feedback, the lesser you'll get frustrated.
2. If he does a different technique, as sempai, ask him to perform the technique that has been shown.
3. Mimic what he's doing when you are uke...ie fall before you are thrown and tap out before you are pinned.
4. Avoid him. neither of you are learning anyway if you practice together so it's just a waste of time partnering with each other. nage should learn from uke and uke should learn from nage. both play an important part in the learning process. There'll be hundreds if not thousands of aikidoka you'll partner in your aikido career so why worry about one. Make the most of your practice when you are at the mat.