Kindergarten ABC worksheets should have different activities to help children identify the various letters of the alphabet. The activities may involve very simple things like colouring, ticking, drawing a line to match items etc. Using attractive illustrations and cartoon characters would make it more fun for children. The activities should be graded, i.e initial activities should be very simple and easy (but should be fun with good pictures etc, so as to interest the child); later worksheets may involve a little bit more work.
Here are a few ideas for such activities: The alphabet song: This remains a lovely way to practise the alphabet. Sing it slowly and sing it often. If you have a large alphabet chart and point out to each letter while you sing, it will be of great value. You can give all children letter cards in order (alphabet flashcards); they can hold up each letter as it is sung. Show a magazine or picture book to children. Ask them to identify all instances of the given letter in any page. Hand out letter cards to all children. Call out a letter. The child with that card has to come in front of the class and display the letter. Divide the class into two groups. Give one group letter cards. Give other group various objects. The first group will hold up a letter. The second group should hold up an object that starts with that letter.