Furthermore, due to my enthusiasm for the subject, I always converse with my organic chemistry teacher who has a doctorate degree and discerns my sincere desire for learning more about biochemistry and thereby lends me his physical chemistry and biochemistry books for which the mathematics is highly complicated and are not requisites for my major.
^This seems like I really long sentence. By the time I got to the end I forgot what the point was. Break it up into multiple ones. Also when you talk about the math it seems kinda arrogant. I understand how it may be important to include this information but try to do so in a more impartial manner.
I also volunteer at Kaiser Permanente Medical Center and Hollywood Presbyterian Medical Center, where I learn and provide quality patient care and thereby make a positive contribution to my community.
^Its understood that you volunteering is contributing to your community. You don't have to reiterate that fact.
Overall its good though. Good luck! :)