Dreaming of praying in the wrong direction

Al salam w alaykum , my Grandmother today saw me in a dream that I was praying and that she was telling (scolding) me that I am not praying in the right direction (qibla) which means that I am going too much to the right and then the next time too much to the left. At last she told me to pray whatever direction I want. What does that mean? I am a muslim kid that is had a hard test today (dont think I did too good) so can you please give me a dua for me getting a good grade Insh’allah on that test or others.