The Norwegian teenager told arsenal.com: "Training with the first team has helped me a lot.
"Everybody there has so much experience, like Kolo Toure and William Gallas.
"I need to see everything and learn what I can. They tell me to be patient, not to rush it, do the right things every single time and stay focused on what we do. Of course, we have to do it well in the games too.
"I have definitely improved because the pace of the football here is much quicker than in Norway. I have become more of a team player, my passing is getting better and I am becoming more professional all over the pitch and off it. I have improved in almost everything."