Hm… ok. So it sounds like you need improvement and it was not just a bad day. One elements to consider is that improving by more than 200 points or 250 points is unbelievably hard. It requires a lot of effort, a lot of focus, and a lot of changes to how you study and how are you absorb the information. On GMAT Club, less than 0.1% of people have improved by more than 220 points. That means you will have to study better and be the best student out of 10,000 others
I just wanted to tell you this before you undertake another journey so that you’re aware of the effort required and you don’t waste your time and money… this cannot be casual. If you want to improve that much, you have to restructure your day schedule, give up certain things, spend all your time reading fiction books to improve your verbal and spend the other time memorizing math shortcuts and constantly be on the lookout for critical reasoning arguments everywhere you read
Buying a course is not going to approve the score. Everyone buys the same courses but people have different improvement and the level of improvement depends on you
https://gmatclub.com/marketplace/ if I have not scared you and hopefully I have not and only inspired, you can check some courses over here
All of them have free trials. Pick one that you like best based on the free trial experience. Shouldn’t take more than a couple hours to figure out which course inspires you and motivate you to study.