I actually really like IR since it seems more logic-based than Q/V, and logic is one of my strengths.
Are you struggling with the questions themselves or just the timing? I think both of those issues can just be solved by practicing problems, just like the other sections of the test.
If I recall correctly, 4/12 are experimental questions, right? So I would think that if you see a problem that looks like it will take a disproportionate amount of time or be much more difficult, then maybe just guess those.
Also, on the actual exam, if you're running low on time, I would guess that it would be a good idea to skip the questions with multiple parts, since you have a greater chance of getting that question wrong. I would focus on the questions with only 1 answer to choose.
Good luck! There are many brilliant people here so posting specific examples of questions will allow you to see other people's thought processes, which may help you develop new perspectives.
KUDOS please if my post was useful!