How to adjust for practice bias in standard I.Q. tests?

You could certainly see how you do on the Stanford Binet instead of the Wechsler. You’re demonstrating a good deal of intelligence in even recognizing that practice bias exists and asking how to escape it. It’s a shame those administering the same test year after year aren’t showing the same level of awareness. But does any raw number matter that much? Here’s and interesting article on the topic.

Obviously you have not taken a complete and valid IQ test.

The G laden portions of the test change per test and are problem solving items that are not memorize-able.

Take reverse span for instance. Getting a list of numbers from the tester and then regurgitating them back to the tester in reverse order is easy to vary.

Was your tester even holding a stop watch to time your tasks?

I could link you to any number of online tests that will tell you nothing about your IQ. Why do that though?.

I agree with @neodarwinian, doesn’t sound like you took a legit test. Nearly all of the test is problem solving, nothing you can really memorize.