Have the child identify the letters then use a bingo marker or stickers to cover the letter if they get it right. If they don't get it right, they leave the letter black and can see at the end which letters they need to practice.
A viewer recently sent in this idea to use the assessments. Have the children draw a letter tile from a box, identify the letter, find it on the sheet and then color it in.
Here is an Amazon link for the letter tiles.