While a cat's intelligence cannot be quantified and ranked like that of humans, based on some research and observations, the following are some cat breeds considered relatively intelligent:
Siamese cat: This breed of cat is very good at learning and understanding human language and behavior.
American Shorthair: This breed of cat has a good learning ability and can quickly understand the trainer's intentions.
British Shorthair cats: They are usually quick to react to changes in their environment and have a good memory.

Persian cat: This breed of cat is very sensitive and highly adaptable to changes in its environment.
Garfield: Although they look lazy, they are actually very smart and good at solving problems.
Tabby cat: This breed of cat is very curious, good at exploring new things, and shows high intelligence.
Sphynx cat: This hairless cat loves to interact with its owner and exhibits high intelligence.
Please note that these are general observations. Each cat's personality and intelligence will be different, and many factors, such as environment, training, and socialization, will affect a cat's behavior and learning ability.