Assuming you don't take any "advanced" math in college, yes, it is in fact that linear.
It's complicated by the fact that often you spend 2 weeks learning a concept and then have the teacher say "It's going to be on the test but you're not going to use it until halfway through next year so try and remember it!" Most everyone forgets it, so we waste another 2 weeks re-learning it next year.
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Assuming you don't take any "advanced" math in college, yes, it is in fact that linear.
It's complicated by the fact that often you spend 2 weeks learning a concept and then have the teacher say "It's going to be on the test but you're not going to use it until halfway through next year so try and remember it!" Most everyone forgets it, so we waste another 2 weeks re-learning it next year.