I noticed that some people might not understand how the stats might work so I'll do a little explanation.
First of all if you haven't read up to around the 8th chapter or so you might not know this but the system have 2 versions.
The normal version, that version would be the equivalent of what we have in our world, 100 in a stat in the normal version would be the equivalent of being close to the max stat someone can reach in our world.
In that version that's how the stats will be graded:
G: 0~29: mediocre, a total beginner.
F: 30~39: bad but can be considered decent for a B team player of an U15 academy.
E: 40~49: stats of an average U15 player in an average team
D: 50~59: stats of a good U15 player or an above average U16 player.
C: 60~69: stats of a star U15 player or a good U16 player
B: 70~79: stats of an average high school player in the main team.
A: 80~89: stats of a good high school player.
S: 90~100: stats of a star high school player.
But then there's the pro version, in the pro version all the stats of the normal version are halved. And this version represents the level of the players in the blue lock world which are obviously way more absurd than the players in our world and thus way better than the normal version, 100 in that version would mean the peak of the stat in the blue lock world.
In that version that's how the stats will be graded:
G: 0~29: mediocre stats, stats of a mediocre or average U16 player at best.
F: 30~39: stats of a high schooler.
E: 40~49: stats of a star high school player.
D: 50~59: stats of a youth team player.
C: 60~69: stats of a below average professional player.
B: 70~79: stats of an average professional player.
A: 80~89: stats of a national class player.
S: 90~99: stats of some of the best players in the worlds such as the New Gen world XI players.
Z: 100: stats of a world class player.
The stat system is pretty simple but there's 2 things to keep in mind, the stats in the system are different than the ones shown in blue lock since the ones in blue lock only show the level of the U20 players.
Another thing is that the stats don't mean that much on their own, the most important thing is how a player make use of those stats and what's their special weapon, if they have any.
A player with all stats are the world class level might only be an average player with an amazing physique and perfect basics.
If there's any question please feel free to ask in the comments and I will reply as soon as I see it.