I'd bet most people who work(ed) at Google were rejected at least once. I was. I'd also bet that if the current engineers working at Google were to be re-interviewed, at least a half of them would be rejected by Google's interview process. What you've experienced is mostly an artifact of having 100+ people apply for each open position, it says nothing at all about your intelligence.

Just do what Ben Pridmore[1] did and study efficient ways to encode information in memory other memory techniques. It breaks some IQ tests so you can walk into Mensa and such (its not that meaningful but neither is using IQ as a metric for getting rejected at google).

unrelated but by your long history of posting about having a low IQ yet working for amazon, what is a low IQ to you?

1. https://en.wikipedia.org/wiki/Ben_Pridmore

Low IQ is apparently getting into Google. I don't think many people regard getting into Amazon as requiring a genius IQ or even an above-average one.