Cleanup of student_quiz_controller.
Cleanup of student_quiz_controller.

mhhassan/expertiza,ApertureScienceInnovators/expertiza,ApertureScienceInnovators/expertiza,KunmiaoYang/expertiza,mhhassan/expertiza,akshayjain114/expertiza,mhhassan/expertiza,KunmiaoYang/expertiza,michaelamoran/expertiza,ApertureScienceInnovators/expertiza,expertiza/expertiza,sid5788/expertiza,expertiza/expertiza,KunmiaoYang/expertiza,expertiza/expertiza,michaelamoran/expertiza,kira0992/expertiza,akshayjain114/expertiza,urmilparikh95/expertiza,akshayjain114/expertiza,joshio1/expertiza,kira0992/expertiza,arpitashekhar/expertiza,redsock88/expertiza,arpitashekhar/expertiza,expertiza/expertiza,KunmiaoYang/expertiza,redsock88/expertiza,rmmaily/expertiza,urmilparikh95/expertiza,sid5788/expertiza,ApertureScienceInnovators/expertiza,urmilparikh95/expertiza,joshio1/expertiza,kira0992/expertiza,rmmaily/expertiza,michaelamoran/expertiza,arpitashekhar/expertiza,sid5788/expertiza,redsock88/expertiza,joshio1/expertiza,urmilparikh95/expertiza,mhhassan/expertiza,arpitashekhar/expertiza,rmmaily/expertiza,sid5788/expertiza,michaelamoran/expertiza,joshio1/expertiza,akshayjain114/expertiza,redsock88/expertiza,kira0992/expertiza,rmmaily/expertiza