My mistakes in term test 2

The worst part after walking out of a test for which you were well prepared is when you realize the mistakes you made. The test was easy however I made some careless mistakes. In the recursion question I forgot to replace fish with image, as fish was just a placeholder in the function. When solving that question I was just thinking what the body of the function should be, in order to get the images in the check-expect function, however I should have made sure that my placeholders were correct as well. I made a mistake in the last question as well, the one which involved putting two images beside each other above another image. I did not leave enough time to solve that question so I did not have time to go over my mistakes in that part. I did not write down what that function on a list containing the last two elements of the original list, due to which my final answer is probably wrong, as it involved putting the image resulting from the function on a list with two elements beside each other and above the last shape in the original list of three shapes. I hope I manage my time better in the final exam so that I have enough time to correct my errors, and not make these kind of mistakes again.