Pretty much, we can't help you if you don't share more information.
Which airline? how was the assessment? how were the assessors? is a good prospective? what did you like about the interviews? what not? etc
Really, be a good lad and share some insights.
From what I can tell you is that a Compass test is a reference test to assess your pilot skills, and as majority of skills, it can be trained and improved, that's the reason they have ask you to apply in 6 months (hoping you will improve), so start practicing.
@max alt
The test comprises of slalom, memory, maths, orientation, multitasking, control.
