Time Saving

It is now the run up to the final exams of my A2s so, not being nearly as clever as my parents think I am, I need to do a lot of revision too get the grades I need to get into university. The issue is, I really want too continue making bentos because I don't like the school food very much and I'm concerned about its nutritional value. I already make lunches the night before because of the time it takes me to get ready in the mornings. Obviously I know that not cutting things into pretty shapes (although mum taught me a great trick to do carrot flowers quicker), and eating more couscous are good ones, but does anyone have any more sugestions?