Why are people on this sub geniuses

I see people with 5 to 6 A stars on this sub. Like that’s actually insane , I can’t fathom it . I feel like a dumbass even with a 3 A star. How much of an advantage does 5 or 6 have . My principal told me that a 3 A star with a strong PS is just as competitive as more A stars but I refuse to believe it . And is 3 A stars generally better than like 2 A stars 3 A . I feel inferior when I get in this sub lmao, people are geniuses