The scoring system at the end is just guessing. The person who wrote the test didn't do any statistics or comparative psychometrics to reach these numbers.
First question was good.
The second question was recognition of a simple principle. If you've learned the principle before the computation side is almost non-existent. It basically measures if you've ever payed attention in a maths class.
Third question was excellent, with two ways to solve.
Fourth question doesn't actually have a correct answer. It's asking you to mind-read. Past the stupid phrasing, it's a little easy.
The whale question is... it's testing perceptual function... not intelligence. There's an argument for them being related, but it's a gimme for anyone that isn't vision impaired information processing side.
The logic section was silly, basically having three questions ride on whether or not you understand logical validity. I must admit I went over this section a few times looking for the catch, but there wasn't one.
The last question doesn't take into account planetary spin or motion. The answer assumes that you're moving at the same speed and direction as the planet, and that the hole is also the axis of any spin. Now because it's not mentioned I guess it's okay to assume that these things aren't at all factors, but I can see people messing up because the question is insufficiently clear. Also, other than the picture depicting it so, nowhere does it state that the tunnel is straight, just that it's 'perfect'.
Oh, the final question, the author said it was a joke, but honestly it seemed like a pretty decent question. I answered
. As QT said, the test does lack anything measuring creativity.