Okay, I will try my best to explain this. With household pets, the only requrement is a clean well groomed cat. Of course you don't them biting or scratching the judges. They look for clean ears,clean coat, bright eyes,clipped nails and then personality. With household pets after all the cats meet that requirement it is the judges personal choice.
Okay, now for the point system. There are 2 types of judges, you have specialty and allbreed. Specialty judges divide the group into 2 classes..long hair and short hair. Allbreed judges do all the cats at one time. So if you have 20 cats in household pet and 6 are short hair and 14 longhair they would split them up in a specialty ring.
Point system... Top 10 awards given if 20 or more cats are entered. Top 5 for 10-19, top 3 for 5-9 and top 1 for 1-3. For household pets
Allbreed final 1st=100pts 2nd=90pts 3rd=80 pts ETC. For a specialty Final 1st=75pts 2nd=65 pts 3rd=55 pts ETC.
The Titles...Regal is 500 pts, Double regal is 500 more pts, triple regal is 500 more pts and quad regal is 500 more pts. Imperial is Quad Regal plus 1000 more points. Then you need 1500 more points to hit quad imperial. To get Superior you need the Quad imperial plus 1000 points with 1 Best allbreed final or 2 Best specialty finals. That is the top for household pets.
For Pure breed cats it's a little different. It would take a lot of typing to explain the whole process. It's a little harder than the household pets. But with the household pets you get a general idea of the whole process.