+/- Competing and Tabata

I'm thinking about competing in a few weeks.  There are actually two tournaments the weekend I was thinking about (April 9th), and while one of them is a little closer, the other might have more women in my weight class.  So once I decide if I'm competing at all, I'll need to figure out which one I want to go to.  It is the weekend after finals, but if I train right I should be tapering that week anyways.  The other issue is that it will be about three weeks after my blue belt test, so if I do pass, I'll have to (get to?) move up to a higher division, and with women's competition these days I'll probably be facing purples belts too...joy. 

In any case, that might all be conjecture since I've been so busy with exams lately (one this morning, another on Thursday) that I haven't done BJJ since last Thursday night, and won't be going again until this Thursday.  To start my preparation, I did a Tabata workout in my bedroom (20 seconds hard work, 10 seconds rest, 8 rounds/exercises for four exercises), with burpees, squats, push-ups from the knees, and sit-ups.  Score was 5/11/10/9, with totals for each of 45/93/83/86.  Starting with the burpees kind of burns me out, but I still didn't feel like the sit-ups were giving me enough of an aerobic workout.  Does anyone have any suggestions for exercises I can incorporate into a Tabata workout that don't require equipment?