There are good and bad groups. I have been invited to so many of these groups that they will show you their fake predictions to entice you to upgrade, and many of these upgrades are not monthly but quarterly, so you will spend a lot of money to get access to their so-called VIP predictions.
Their predictions are not 100% accurate, and you can also lose money. Your chances are 50% of making a profit, so check the feedback from past members to gauge their accuracy.