[University Chemistry] IR Spectra Help

Hey everyone, I've been working on this spectra for awhile, but I'm a bit confused as to if I'm on the right track. Here's my notes so far:

A) sp2 C-H stretch B) sp3 C-H stretch C) D) E) F) H + I) -NO2 two strong intensity bands G+H+I+J) Benzene G) C=C 1660-1640 K+L) Strong intensity = benzene

LINK TO THE SPECTRA HERE

Any help is appreciated. :)