Jiyu Waza 1v1, 1v2, 1v3, etc., 2v3, 2v4, 3v4, 3v5, etc., with fixed attack, any attack, unarmed, weapons, etc.
Also, an exercise which I very much like, is where you have Tori (Sh'te/Nage) standing in the middle surrounded by the Uke's - at least 4. One person controls the exercise by pointing at one Uke at a time, the Uke then shouts out an attack and then immediately attacks that way. Tori must shout out a technique (optional) and performs it against that attack. The next attack comes immediately from a randomly chosen Uke.
This can also be done with Uke only calling attetion to themself and not calling out the attack. A very good exercise.
BTW, James. How are you and Roger enjoying your new school?