compile footages into a collage

Need to start & complete within today. Create a 15 seconds footage that is made up of: 1. 3 seconds long footage that is made up of a collage (see attached) of nine separate footages which you need to compile together. You will need to gather these footages individually following clear instructions. 2. another 2 second long footage, same as above, also made up of nine smalls screens combined into one ( You will need to gather these footages individually following clear instructions); 3. another 3 seconds long footage, also same as above 1 & 2 but with 6 different footages ( You will need to gather these footages individually following clear instructions) Thank you!