Toadblatt's School of Sorcery is a parody of Hogwarts. Just like in the Harry Potter Universe, students are accepted at the age of eleven. However, it is unknown how half-bloods are accepted. Hogwarts and Toadblatt's are similar in certain ways. For example, both have four houses, different teachers for Defense Against the Dark Arts, etc. But on the contrary, they are somewhat different. For one thing, in Harry Potter, they sort the students by a Sorting Hat. At Toadblatt's, they might use a squid, possibly Dean Toadblatt's pet. Hogwarts also has prefects, but Toadblatt's only prefect mentioned is Grim. Toadblatt's also somewhat resembles Hogwarts as well.