Why do the green amber and red trays have to relate specifically to maths? I have used them in the past and any work the children have done has gone into the appropriately coloured tray. If you have three for maths, then there's the potential for three for language, three for topic work...... Time saving tips: Peer assessment, self assessment, maths is a prime example of where self marking comes into play, give the children a pen and the answer book then sign and date when they're finished marking to show you've seen it. Get the whole group out with a pen, give them someone elses book and then read out the answers. They can decided whether the person they're marking deserves a sticker, write their own messages of encouragement/pieces of advice etc. Writing-wise, choose one group to assess per week. There's nothing worse than trying to mark 30 pieces of writing in one evening. It's pretty demoralising. Split the class into smaller numbers and properly assess one group a week. Look at the AiFL strategies as well, they're designed to help. If a child is marking themselves as green, then do you really need to assess the entire page?