Congratulation.
SSBs aim to see if you have a positive attitude and if you can work in a team, apart from Leadership.
Even if they show you a pathetic picture, try to see the good side of it and then write. It is done in quick time and so one gets exposed.
In the Group Tests, you will find the chaps who have been trained in places like the Minerva Academy Jullunder, very pushy. Be calm and while it is important to take part don't rush in like a bull, do it calmly and give sane and scientific suggestions how to do it and try to do it that way.