Making Dua for success in studies

As-salamu alaykum, everyone! I'm about to get my exam results soon and I really want to achieve all A\(^\ast\)s. Truth be told, I didn't work as hard as I could have, but I gave it my best effort. Could anyone share advice on how to make sincere dua for good results? I want to seek Allah's help and bless my efforts, inshaAllah.