I didn't give it much time because I put more emphasis on the quant and verbal content. BUT if you learn the content for the quant and verbal pretty well, you should see an improvement in your IR score, at least that's how it was for me.
The only familiarity I had with IR was through practice tests. I'll confess that after about 5 tests I had the general idea down, and was able to recognize patterns in questions. So, in essence, the IR can be beaten, but ultimately you should first have a good grasp of the math and verbal topics since it's much easier to 'get familiar' with how these questions are worded.
