exam "weak"

I, as a medical student always feel miserable when the exam fever is came. Never am i finished my revision for every exam since first year. I sometimes wonder whether the problem is arised from me, syllabus, lecturer, environment, references, college, exam format or luck. For every examination, which include the end of posting test, i have given my very best. But still, the outcome is poor. My motive of doing good is not motivated by the result (we, only in our college, the result is only accessible by administrative/academic officer). Instead, my aims is just simply to please my lecturers so that our college is not notable at the bottom line.

I desperately needing help for my study to meet my lovely, caring lecturer's (credit go to Dato G especially) target and expectation. Another long case examination (surgery) has passed. I am still not capable of organising my flow of thought and knowledge, perhaps i should do an EEG to detect is there any inter connection between my brain hemispheres.

I feel sad, depress, embarass for not performing up to the level my lecturer expected me to be. The feel of guilt is gush in my vein. I pray, and pray for forgiveness.

Why?why?my memory capacity is so limited. A breakthrough for my problem is all i needed as i am not afford to fail in my professional exam that is just around the corner.