haha you are gallant dude..very less members will apply on DEC 7 that is last day for submission..It wont effect your visa chances if your file is good..Don't worry you ill get it by 20 th..
Noo bro.Its not at all a problem..They wont spoil a students life by considering your late application..I think that it may not be a problem..Ensure that you file is up to date and clear with all required documents..I am sure you will get visa..