Read the following context and answer the question.
Context: I slept at 9 until about 12:30 last night in a sad , desperation and quasi - necessity to assuage my fatigue . I studied Physics until 3 AM , when , ultimately , I found myself tired again and slept until the morning sun blazed its sardonic laughter through my windows . Spending five hours in the last day studying for Physics did not pay off at all when ( surprise , surprise ) I failed my Physics exam again .
Question: What may be the reason for them failing even though they studied so hard ?
Answer:


It is a hard subject .