The beginning of a school year is always a good time to practice the alphabet. It's quite easy to learn it by heart and to recite all the letters in the specific order. It's getting difficult when it comes to pronuncing letters randomly, e.g. to spell a word. Mastering a skill requires practice.
I've found an interesting website where you can not only listen how to pronounce particular letters, but also practice your listening and speaking skills. Click on the gear icon to change the settings.