Is hogwarts the only magic school?
No. There are at least three mentioned as part of the tri-wizard tournament.
to get into Hogwarts, several degrees are needed; 3 a-levels in magic. 1 AS level in triple award science. a good knowledge on mystical creatures, potions and lotions. you will need to know how to fly a broomstick and be able to preform magical spells and use your magic wand i myself, am attending Hogwarts school of Wizardry, and i love it! hope this can help :)
I hope you understand that Hogwarts School is fictitious. It doesn't exist, except in the Harry Potter fantasy novels. According to the story, children who have the potential for magic would eventually receive a letter of invitation. The Wikipedia article on "Hogwarts" has more details on the admission process.
Muggle born wizards/witches The ministry of magic knows when magic is performed somewhere in the muggle world and therefore can identify muggle witches and wizards. The ministry and Hogwarts school has been known to work together at sometimes if not always. --- The minute someone magical is born, their name is (magically) written down on an enrollment list for Hogwarts.
Several locations in the UK were used for the school: Alnwick Castle was used for "outside" views Gloucester Cathedral - Gloucester (Hogwarts School, Corridors) Divinity School, Bodleian Library - Oxford (Hogwarts School, sanatorium scenes) Duke Humfrey's Library, Bodleian Library - Oxford (Hogwarts School, library scenes) Christ Church College, St Aldate's - Oxford (Hogwarts School, The Great Hall) Harrow School - Harrow (Hogwarts School, Classroom) Lacock Abbey - Wiltshire (Hogwarts School, Various interior scenes) Durham Cathedral…