dah, bro.

I managed to win against world class quite frequently now.
I always spam jockey and use 2nd player pressing when defending, it is almost impossible to do stand/slide tackle against them, the AI automatically avoids once we press the tackle button.
And I use less skill, and more passing while attacking. I watched a pro player's video, he said it is very difficult to use skill against world class difficulty AI, hence use more short pass.
Just my two cents. Good luck mate!

jockey can be done by pressing LT, the defender will enter defending state (preparing to block or intercept any passing and shooting attempt). It will also makes your tackles to be more accurate.
I used the word "spamming" is because you cannot keep pressing LT as it will makes your player becomes slower.
For example, when your opponent is sprinting, I will sprint (press RT) parallel to the player, and tapping LT+RT (Jockey while running) everytime the ball reaches opponent's foot to prepare for his next action (he can only passes or doing skill once the ball reaches his foot). If he keeps sprinting, release LT, and continue running with him. By doing this, it will make him harder to pass or dribble against you.

2nd player pressing is RB button while defending. It will call the closest teammate to leave their position and help to press the player with the ball. Need to be careful not to leave too much empty space in the defense though.

This is the most suitable method for me to improve my defense. Perhaps there are more efficient ways.