For some tests, that's not the right approach. Going in order may be a bad idea. Actually trying to immediately solve the problems may be a bad idea. For example, it may be more efficient to check the units of all the multiple-choice answers first, to see if there's only one that's possibly correct.
You could try to figure out the best strategy during the test, but it's far more effective to learn these things before the test.
If you've already done a dozen practice tests, you'll know what kinds of methods there are to quickly eliminate incorrect multiple-choice answers. You'll know, say, that there are fundamentally 8 types of problems, and you'll be able to skim the test and immediately recognize which problems call into which categories.
This is why people who do test prep get higher scores.
That doesn't mean that we should throw out standardized tests, but it is silly to deny that test prep helps (a lot).
And yet despite your incredulous, fake outrage, the stats simply show that test prep helps people significantly.
If you really want more reasons, read the other response that DiogenesKynikos gave to you in the post.
My problem is with you make false statements here. Be as mad as you want about the fake that test prep helps a lot of people, significantly, but do not make false claims, and ignore the fact that the stats show that it works.
1. Read the rules of the tests. Come on! Does one really need handholding with this?
2. Understanding the probability of success at guessing based on how many of the answers you can eliminate is trivial probability, which goes back to my advice to pay attention in math class.
3. "how long to spend on a question" I'm laughing/crying now. It's third grade arithmetic to figure out the time per question. You know, number of minutes for the test divided by the number of questions. Of course skim the test picking off the easy ones then the medium ones and save the hard ones for last. This is just common sense.
If this is what test prep is, things are much worse than I thought. Who needs to be told that reading the instructions is a strategy for doing well on the test? My gawd.