First of all I must say, that this is not correct to ask “what is the probability for ME to receive “A” grade”. Because this is not a random event. The result of my grade depends on my skills and teacher’s evaluation – and these factors are not random. The definition of probability is related to random events or random variables, etc. We can only say about the probability of “randomly picked student will receive “A” grade” or “randomly picked exam/research work will be evaluated with A”, etc.
However, we can statistically calculate, what’s