The thing is that you did not get a 64% in December. You scored 50-70% on all sections except two and in those sections you were probably very close to 50%. I have spoken to former test graders and have seen several examples of people who passed with 63/62 on L1 December using 40-60-80. Their 50-70s were probably like 65 and yours were probably like 52...
63% WILL get it done on June 2007 CFA 1
63% WILL get it done on June 2007 CFA 1