Are they coming back in 100 years, i.e. 2120, or are they coming back in 3020, which would be a thousand years not a hundred?

Oops I'll edit the question. I meant 2120

Could you clarify what you mean in the third test? Are you talking about deadlifting 120 lbs (which is the strongest lift by a human and many smaller adult females can perform this lift) or bench pressing 120 lbs (which only a few of the fittest males can perform)?

@Green edited the question to clarify.

I have a follow up question. What happens when the parents of the aliens find out that their teenage sons stole a car and threatened an unadvanced planet with some ridiculous demands?

@XandarTheZenon I see this test as a blessing in disguise. Half the world's population can't easily pass these tests because they are malnourished and uneducated. A Do-Or-Die imperative to uplift that bottom half of humanity is fantastic thing.

@fi12 It's lucky that the aliens didn't pick "Add 100 to a four-digit number" as one of the tests; we'd be screwed.

@Green Maybe that was the aliens' intention. But what will be the cost of this? Will governments start dropping the pretense of freedom "because necessity demands it"? Will the government get to control everyone's lives in order to prepare for something that won't happen for a hundred years? Because if that happens, then maybe those aliens mightl feel at least a little bad. Maybe they'll cancel the test. Maybe they'll realize it was wrong to come threaten a planet of less advanced people. Maybe even if we manage to upgrade earth, we'll be worse off than before.

@XandarTheZenon or what if this is a huge game show to them? Pick a random, undeveloped planet, issue the test then in 100 years come back for contestants. What do they care if all the humans kill each other along the way, all they care about are their ratings. :)

@XandarTheZenon And I'm not worried about authoritarian governments in this case. The conditions of the tests select for the improvement of all humans in terms of education and living conditions. A government forcing everyone to meet bare-minimum standards sounds harsh but getting an education and living a healthy lifestyle isn't bad.

@Green I was actually going to ask if this kind of test would help lift humans out of poverty but you seem to have answered it!

so do you guys definitely think we could survive?

Does anyone else see Jigsaw's hand in this plot? This seems like his cup of tea.

Can you explain the hands touching the ground issue on benchpressing? I can't imagine how that would happen.

@Joel don't worry, the question has been edited. that part is no longer part of the question.

Easy we bust our asses getting all but the 10 we want to take the test off of the planet and return once they pass with flying colours.

@Green Not too sure about that. Governments are great at screwing things up. Look at the countries with longer school days and tell my why they are out performed by countries that have shorter school days and less testing.

@Green Hahahahahahaha. You think humanity won't ignore it until 5-10 years before the deadline.

@immibis I'd be worried about that iff humanity wasn't already doing something about it. Some aspects of the tests humanity will forget about till a few years before and that's okay. As the accepted answer states, human skill decays with disuse. Spending tons of money on algebra 20 years before hand won't get you much.

@rom016 lifting all but 10 off the planet is completely unfeasible. It takes too much energy to lift that much water into orbit. XKCD's What If has a lovely discussion about what would be involved.

@rom016 Given the nature of these tests, the pressure on all governments to perform will be immense and any action they take or don't take will be highly visible. True, government in general has a long history of mismanagement. But the Apollo program was a government program and that was an unqualified success. You can't say all government is bad.

@Green unqualified success HA HA Ha ha haaaa they may have achieved it but they screwed up real bad along the way. Lets just ignore the experts saying the o rings will fail killing the whole crew. Rethinking moving all but 10 you could just move all that are likely to fail. I am sure this will ignite the same drive for space as the Russian threat and thus we could move everyone with all the animals to boot.

Why do aliens use the awful imperial units?

Just a random thought:Do humans need to be entirely humans ?What if we would put all of our effort on robotics science and everyone ,by 100 years, will have implemented in their body mechanical parts that will allow everyone to be somewhat "superhumans".So the challenge would be to get the best scientists to work on that and the rest of human kind to practice their math skills for 100 years.This is somewhat more doable in my opinion.

(I missed a question mark in the last comment....)