I think your understanding of evolution is a little off. It's understandable - it's a complex subject, and it's hard to understand some parts of it without a grad school-level understanding of biology, so it's no wonder that people have a hard time grasping it with a high school-level understanding of biology. To make matters worse, it's often taught poorly, and there's a lot of misinformation out there.
So, first things first, evolution is a theory, but it's a theory in the scientific sense. The scientific meaning (and the *original* meaning) of the word "theory" is a comprehensive explanation of something. A theory draws from lots of evidence, and can be used to make predictions. In other words, a scientific law tells us *what* happens, and a theory tells us *how* and *why* it happens. A theory is not a guess, and a theory can never graduate into a law, nor can it be boiled down into a simple fact.
It looks like you're making the (very common) mistake of looking at evolution like a ladder. It's really more like a branching tree. Species split off into other species, and different groups follow their own evolutionary paths. Existing species NEVER evolve into other existing species, and existing species never evolve twice. Monkeys, for example, will never evolve into humans - and humans did not evolve from monkeys. We share a common ancestor (which was monkey-like, but biologically speaking, as different from modern monkeys as it was from us). That ancestor went extinct loooong ago.
It also looks like your ascribing intent and planning to evolution. In truth, it's not a thinking process. It's not even really a process - it's a result. Each new generation is the same species as the previous, but there are always small variations. You're not exactly like your parents. Individuals born with a beneficial trait have a survival advantage, and therefore have a higher chance of living long enough to reproduce - and pass that beneficial trait on to the next generation. Repeat enough times, and you start to see larger changes.
Finally, don't think of evolution as having a goal. We humans are most definitely not the "pinnacle of evolution" or any other such nonsense. Our intelligence is just one survival trait. Biologically, it's no different from an elephant's strength, or a mouse's fast reproductive cycle, or a cockroach's ability to eat virtually anything. Intelligence has obvious benefits, but also pretty big drawbacks (our brains account for 20% of our body's energy usage, they're large and vulnerable, they complicate childbirth, etc). Intelligence happens to work for us (and our ancestors were in a position to make use of it, otherwise it never would have evolved), but it doesn't work for all other species. It might evolve again in another species, given enough time, but it's far from certain.
I recommend checking out the link below. There's a really good introduction to the subject. I also recommend studying up on biology - you can't hope to understand how life changes over time if you don't understand how life works in the first place.