In most tests, you only get a 1/4 point deduction for every mistake, meaning if you guess blindly, there is a good chance of you breaking even and maybe getting higher/lower than you should.
You could turn the odds in your favor however.
See this example:
Question 1: What does the word assiduous, used in this sentence, most nearly mean?
She was an assiduous student who promptly submitted her homework and projects on time.
Let's assume you know nothing about what the word means. You can still infer from the sentence that assiduous definitely does not mean "lazy," because it describes her as someone who submits homework on time, so you could cross it out.
By doing this you've somehow beaten the right minus wrong feature of the test. You now have a 1/3 chance of getting it right, which could make or break your application because of the incredible competition for slots in UP
2. Work quickly and never stick to one item.
Remember that each item, no matter the difficulty, is worth only 1 point.
Those crafty professors at UP might even have put all the easy items at the end for all you know, so its best to run through the entire section and get as many easy points as you can. You can always come back for the others later on.
3. Bring a lot of pencils
Imagine yourself on test day, sweating over that darn trig item that you've never even studied.
You're sweating. You can feel your pulse racing in your wrist. You already can see the look of your mother, eyebrows raised and frying pan in hand, when you find out you failed the test. "'Yan kasi! Puro facebook na lang ang inaatupag! blablablablablablabla!"
Then your pencils snaps/becomes too dull. (This will happen again and again throughout the test)
Is this the moment you'd think you'll have the nerves to sharpen your pencil? I'd guess not.
Save yourself some time and anxiety by having extra sharpened pencils on the side. This also lets you focus on being the test answering machine you should have honed yourself to be by this time.