LOL, I'm sorry , I should have explained myself better:
IIRC = If I recall correctly.
So, to be able to enter the hardest level of racing, you must be,
if I recall correctly, at least 50th in the Enthusia Life ranking!
KotY = King of the Year (race)
"King of the Year" is the name of the "ultimate race" in
Enthusia Life (that's what the game calls its career mode) . If you beat that race, you beat the game (get to see the ending credits, not anything that could change your life forever
)
So, in short.
When you start Enthusia Life you start at the bottom of the ranking (1000th position). You move up by racing, unlocking cars, leveling up the cars you are using). The first races you are able to enter are the easier ones (I think it's the RIV category), smaller ones and in small tracks like Marco Strada. They give you very few points.
As you progress you unlock higher levels of racing. You get tougher oponents, longer races in longer tracks. The points awarded per race are a lot more than at the beggining and allow you to climb the ranking.
WHEN you get to 50th in the ranking the last and hardest class of races becomes available (I Think, but I am not sure, this race-class is called "S" class in the game).
In this level, you no longer are able to choose between races, the "S" class has ONE race per game-week, in a pre-defined schedule that you can consult in the game "Calendar". And you must be with the right car, with the right specs, to be able to enter this race, or else you'll have to skip the week or resort to race in an inferior class.
Complicated? It gets better!
To be able to enter the "KING OF THE YEAR" race, you must get to the last week of any given game-year placed at least 6th in the ranking AND with the right car to enter that last race (road car, but a good one, if I recall correctly). The "King of the Year" race is a 3 lapper at the Nurburgring Nordschleife and against the toughest AI the game can provide. Not easy ...
Hope this cleared your doubts. If not, check the FAQ thread, maybe all other questions you have can be cleared by reading it. Good luck!