Please say a little prayer for Bill? He is being deluged by students who want to know how to get a better grade now that the semester is over and their exam is done (or for the other class is tomorrow).
How can you NOT know that the homework assignments are that important if it is a. told in class that they will count for 30 percent of your grade and b. mentioned in the syllabus?
"I really need a good grade in this class or it will affect my scholarship" may be very tragic, but it's not a good reason to alter a grade.
Why would they THINK that you just need to ask to have:
homework grades dropped just because you didn't do well on them?
grades being added to just because you 'need it'?
If you need good grades, study and do the homework assignments. If that isn't enough, come during the semester to ask for help. If that isn't enough, maybe you simply are not cut out for this course?