That is unfortunate. Did you not study for either IR or AWA? Business schools will probably not put too much weight on IR, but a 3 in IR and a 4 in AWA may raise some flags. I would suggest retaking it, but I would ask one of the admissions consultants here
If you do decide to retake the GMAT, have a look at this thread
for IR. For AWA, have a look at Chineseburned's AWA guide
. I only spent a few minutes studying GMATPrep IR and Chineseburned's guide and got a 7 on IR and a 5.5 on AWA.
I hope that helps
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