Congrats anupam...You did make it to the 700 club...Not all universities in the top 15 look for an 80 80 split. If you can compile a terrific essay incorporating your school experience(leadership involvements, organizational memberships, GPA,other achievements), volunteering & community involvements and anything that might be an interesting/learning experience....
Why lose heart so early on? There is always a chance to retake it if you have time...