Excuse me, can you expand on this?
You guys don't have an standardized education system?
What about College requirements? are those different from state to state as well?
There are very basic standards at the federal level, but states usually set most of the requirements and then the local school district goes into even more detail. There is a lot of variation between states and then even more between districts. A school district in suburb Seattle, where Microsoft, Costco, Starbucks, Amazon, and Expedia employees live is going to have a lot of money from residential property taxes and a lot of parental pressure to push student standards has high as possible. This is a far cry from the small town that Paulina has visited where there is probably bare minimum revenue from property taxes (many inner city districts don't have enough) and what little push there is from parents is more for resistance from federal intrusion from things like common core. When you read things like, "your chance of success is determined most by the zip (postal) code you live in", this is what it is referring to.
College requirements are different for each university.
The only thing that is standard are the regular SAT and ACT tests. However they only measure math, grammar, and reading comprehension. There are additional more specialized SAT and ACT tests in specific subjects that more competitive colleges require, so only the more academically driven students are going to put time into them. Similarly, the Advance Placement tests that students can take that will replace a first semester introductory class are the same for every HS student taking them. Again however, only the most dedicated fraction of students will have the interest or resources to put time into preparing and taking them. Also keep in mind that many students don't even take the SAT because they're going to drive trucks, work the family farm, or do plumbing/carpentry/etc. They still need to know "how to learn" as all that work is getting more and more digital in some way.
