I think that the biology and possibly the developmental section of psychology will benefit me the most five years from now. Right now I plan on going into the field of nursing and I know that knowing what different parts of the body and brain are meant for will be great for me to know. If I can expand my knowledge on the brain, neurons and all of the different systems even further I know that I will end up going very far in this field.
The developmental part could be very useful also because in five years I could be married with children on the way. I think that it would be very difficult to raise a child and not know how he/she is supposed to be developing at different stages in their lives.
I am pretty sure that knowing information on most all of the sections in this textbook will eventually come back to me and help at different points in my life but these two seem that they will be the most helpful to me.