I would take these pearls of wisdom from a user that has been here for 3 days with a huge grain of salt.
With very limited exceptions (e.g. Calc BC, Chinese) the percentage of students getting a 5 is <20%; I would not call those students who do not get a 5 as incompetent.
At whatever point this user graduates from HS and goes to college, s/he will be in for a rude awakening when the median grade for a math/science midterm is in the 50-60% range. Then’s s/he be more than thankful for the curve.