Lalalalalalalalalala

I've been studying for this exam for the past few months already and took the exam twice and failed with the same average result which doesn't go higher with 65-69% and I'm getting frustrated with it.

Am I dumb that I can't go higher with the passing rate? Is my knowledge is not enough for the exam? or does the title of being a professional civil service is not for me? What is it that I'm lacking of? I need answers but I can't find the lacking questions really.

I've been in the peak of my patience this past few days due to the fact that my mother keeps calling me (using her phone) to summon me for food. And I'm either asleep when she is making this habits. And there is this proverb in my country that
'Mag biro ka nalang sa lasing wag lang sa bagong gising' (make fun on a drunk man rather than the person who have just awoken)