…thanks for the reply marwah,
you know the problem is that when i was in high school or earlier years of my college that crash study used to work very well for me. i used to study few hours right before the exam or do the paper a night before it’s due and i used to get really nice grades. NOW since i am taking classes that are much harder and require a lot of understanding i can’t do that anymore, and this is why it’s getting even more frustrated with me. but the problem is that i have spoiled my self SO BAD from back then when i still used to get good grades from crash studying.
for example, i taking this microprocessors class, and i never ever had that class before, i wasn’t even familiar of the content when i stepped in the class. learning microprocessors language is like learning french, or some really hard foreign language :S
it wasn’t like biology or psychology where just reading every chapter makes me ready to take the test, it’s a class where i need to understand things, take time and work out the actual stuff to understand. which i didn’t do and now i have pay for it 
i wish i can break away from that bad habit, but even right now if i think about any upcoming test or paper i think, oh i have time, i will do it. and just couldn’t get around doing it till the last moment.