Here are three quizzes (and their keys) to use in your beginning level Spanish class. You can easily differentiate just by distributing the quizzes according to the level of your individual students!
The first quiz is the modified version, so it has multiple choice and simplified formatting. The second is just the average quiz, and the third is the advanced quiz, which adds on 5 questions about school supplies. All three quizzes are over classes and conjugations of ser.