That's not to say that Filch had definitely not started using Kwikspell. The envelope Harry sees also contains lesson one from the course itself. Harry was just reading 'Lesson One: Holding Your Wand (Some Useful Tips)' when shuffling footsteps outside told him Filch was coming back. (Chamber of Secrets, Chapter 8, The Deathday Party).
Squibs have been known to try and teach themselves magic As it turns out, Filch is a Squib, and has been partaking in a 'Kwikspell' course: a set of magical lessons for wizarding beginners.
Weaknesses. Argus Filch is a Squib, a child of wizard parents who has the inability to use magic. Harry discovers this in Harry Potter and the Chamber of Secrets when he spies Filch's "Kwikspell" letter, although he does not understand what that means until Filch says in front of him and Ron, "He knows I'm...
Filch helped the students evacuate during the Battle of Hogwarts in 1998 and participated in the battle himself. He kept his job of caretaker after the Second Wizarding War. Filch was also the only one of the Hogwarts staff to stay at Hogwarts Castle during the summer holidays.
A Squib, also known as a wizard-born, was a non-magical person who was born to at least one magical parent. Squibs were, in essence, "wizard-born Muggles". They were rare and were looked upon with a degree of disdain by some witches and wizards, particularly pure-bloods.
Argus Filch is the caretaker of Hogwarts. While he is not an evil character, he is ill-tempered, which makes him unpopular with the student body, and occasionally causes tension or exasperation with teachers and other staff.
Filch was Hogwarts' caretaker, but he was also a squib - a Muggle born from wizard parents (which may possibly be the case of Jacob Kowalski from Fantastic Beasts as well).
Catelyn DID swear an oath to Walder. But, then, it's pretty dramatic to go and have the woman (and her family) slaughtered. Family drama aside, DAMN. This means ARGUS FILCH KILLED HERMIONE'S MOM!
And Filch talks to her like she's a human and calls her "my sweet." It's clear she's a maledictus, married Filch when she was still able to take human form, and then she succumbed to the blood curse and became permanently a cat, but Filch still loves her as his wife.
The answer is: NO.
The trio of Harry Potter, Ron Weasley and Hermione Granger consists of all three types of Wizards. Harry being half-blood, Ron being Pure-blood, and Hermione being Muggle-born.
The fan asked the author if Aunt Petunia was a Squib (a non-magical person who is born to at least one magical parent) and Rowling replied: "Good question. No, she is not, she is not a Squib. She is a Muggle.
Harry himself is a half-blood, since his pure-blood father, James, married a Muggle-born witch named Lily, and his maternal grandparents were Muggles.
It was said by Molly, in the 1994–1995 school year, that Arthur still had the marks inflicted on him. By 1973, Mr Pringle had retired, died, or left the school, and was replaced by Argus Filch and his cat, Mrs Norris.
Battle of Hogwarts Mrs Norris was likely put away during the battle, being a cat. She survived the battle, and was with Filch as he swept up debris in the Great Hall, sitting next to a pile of rubble.
"A Squib is someone who was born into a wizarding family but hasn't got any magic powers. Kind of the opposite of Muggle-born wizards, but Squibs are quite unusual."
This was likely only because of Filch’s own hope that something might work . The Kwikspell course was marketed to unskilled wizards - it never claimed to be able to make Squibs magical.
So by using Kwikspell, which is designed to help wizards with poor magical skills, they can distinguish them from squibs.
And yet, he has a Kwikspell letter in his office. Ron defines a Squib as "someone who was born into a wizarding family but hasn't got any magic powers.".
Filch brought Harry Potter to his office, intending to write Harry a punishment report for dripping mud from his dirty Quidditch robes onto the castle floor.
There is an answer!". — Kwikspell letter [src] Kwikspell is a correspondence course in beginner's magic run by the Kwikspell Company. The course is designed to help adult witches and wizards brush up on their magical skills.
Kwikspell's introduction letter included apparent testimonials from Madam Z. Nettles and Warlock D.J. Prod, who were said to have had poor magical skills but been helped by the course. It isn't known if these testimonials were genuine.
Filch presumably wanted Kwikspell to try to become magical through using it . However, J.K. Rowling stated on her website that it never worked.
This was likely only because of Filch’s own hope that something might work . The Kwikspell course was marketed to unskilled wizards - it never claimed to be able to make Squibs magical.
So by using Kwikspell, which is designed to help wizards with poor magical skills, they can distinguish them from squibs.
And yet, he has a Kwikspell letter in his office. Ron defines a Squib as "someone who was born into a wizarding family but hasn't got any magic powers.".
Filch presumably wanted Kwikspell to try to become magical through using it . However, J.K. Rowling stated on her website that it never worked.
Kwikspell is an all-new, fail-safe, quick-result, easy-learn course. Hundreds of witches and wizards have benefited from the Kwikspell method!”
The Kwikspell course literature comes with two testimonials.
Neither of these characters can perform magic (Filch’ s Kwikspell course never worked), but they still function within the wizarding world because they have access to certain magical objects and creatures that can help them
An answer from any level of canon is welcome.
He's sending off his money and getting "lessons" by owl, and almost certainly gaining nothing from it, other than a misplaced confidence that he will, in time, be able to use magic. We know he wasn' t able to use magic, even up to the Battle of Hogwarts.
The testimonials as well reflect people who were able to do magic poorly, rather than not at all:
Like most correspondence courses, they're probably most effective if you apply yourself and have some natural ability . JKR confirmed that Filch's course was utterly ineffective, but that doesn't mean that it doesn't work for everyone, just that it didn't work for him (presumably because no courses will help a squib to become magical).
There is an answer!". — Kwikspell letter [src] Kwikspell is a correspondence course in beginner's magic run by the Kwikspell Company. The course is designed to help adult witches and wizards brush up on their magical skills.
Kwikspell's introduction letter included apparent testimonials from Madam Z. Nettles and Warlock D.J. Prod, who were said to have had poor magical skills but been helped by the course. It isn't known if these testimonials were genuine.
The Kwikspell Company also produces a study course for the W.O.M.B.A.T Examination called the Wallop the Wombat Revision Course. This is recommended to those who achieve only a Poor on the Grade 3 test (JKR-W3). The letter from Kwikspell that Harry Potter reads, belonging to Argus Filch ( CS8 ): Kwikspell.
Filch brought Harry Potter to his office, intending to write Harry a punishment report for dripping mud from his dirty Quidditch robes onto the castle floor.