i went from losing against 1400 players to beat some 1900 players otb in around 200 hours of serious training, i spent around 60% of that time solving tactics puzzles the other 40% between strategic play, endgames and a little bit of openings.
Sounds right.
To be an A class player you don't say << I will play chess 3h/day and I WILL BE an A class player>>
Who knows? You may be the world champion one day, may you don't.
These things aren't planed. You don't know what will happen.
Although it's true, you don't always know what will happen in life. It is also true you are in control of your own life and can affect its outcomes and results.