Not able to go on next level, while i had already completed previous one.

Answer 1

U need to make 180 XP to up to level 5

Answer 2

Question is not clear .. can you elaborate? You are now in level 6.

edit :
Palak Akolkar information about XP from search.. hope it helps....

https://code.sololearn.com/W8VlpU6g6Ps7/?ref=app

https://code.sololearn.com/WPWPl1tlA2fO/?ref=app