How can i get more xp in less time???

Try to aim for badges too. Quite the amount of XP compared to challenges when you're quite done with the latter.

You get daily XP . You get XP when you unlock new badges. You get XP when you win challenges. You get XP from each like and comment on your post. You get XP from each question you answer correctly in any course. And you get a lot of XP when you Finish a course.

play more challenges in less time

try to unlock new badges and try to play more challange both will give u more xp easily but u have to win the challenges

thanks for answering