Give one, get one.
For key words, match the definition to key words, pictionary, taboo, er ally linking a number of key words together.
Anything that involves thick marker pens! If you cleaner is ok with it and it is last thing in the day write in the tables/window. If not buy the huge party style paper table cloths for them to write on. Anything involving whiteboards.
Revision races. In groups the students have a long exam questions to answer. The whole groups knows the question but the answer is at the other side of the room, each student with the baton (pen) gets to spend one minute adding to the answer in turn but they can dicuss their answers. Sorry just retread your post of sit down shut up.
Competitive teams with chocolate prizes. Quizzes. You can even get them in small teams to create 5 questions and answers and you have a ready made quiz. Writing the quiz and answers can be used as an activity in itself or as a last minute extension activity. Can be used with not seating. Pick on child expert to stand at the front and get the other students to ask them a question, if the other students think the person in the hot seat is correct they hold up a green card/yes or red card/no.
Quick on the draw on the draw using revision materials.
The classic poster but with a success criteria and peer assess.
If they are low ability try to avoid covering too much, too fast.
Are there any short video clips which are useful bbc bite size? What the video clip and then they draw around their hand and in each finger write down one fact they have learnt.
Mind movies. You slowly read out the information, read each paragraph twice and they take notes/ draw the info. They then used a ready prepared check list to see how lunch they have recorded. Without looking at info they then re-record the info eg paragraph or cartoon and go through the check list again.