Manual Grading Of Questions

I need to make the following happen
Students will take an exam,it will have two type of questions,one is essay type,another is multiple choice.when they finish the exam,they will see multiple choice question answers and their obtained mark.the essay type answer will be manually graded by a teacher and results sent to student later.
bp-courseware makes the mcq possible,but manual grading?
or if it’s not possible,then is there an option like assignment(the essay type),so the teacher can grade the essay later

http://wordpress.org/extend/plugins/buddypress-courseware/