Should I Stay or Should I Go?

Sorry I was busy recently doing some kind of work at the moment, on the job training. Now I start to question myself, am i suitable for this post?

I can say HR/PR matters not an issue but only setback I don't know much about technical but I am learning. Alot of things depending hands on.

Currently I am learning new things everyday in the company and I am trying to understand how does the Metrix system works be it Technical or Management, interesting but I have my reserve. Is been a long time I never have any test(assessment) since my secondary school dayz and I having assessment this coming week and I am getting nervous, I have to score at least min 85% to get into the company.

So should I stay or should I go????