This is what the OP said:
I recently bought the OEM 18s and plan to use them as a track wheel.
Since he mentioned a dedicated set of track wheels and tires, that was the basis for recommending R6s, which are not slicks, technically. He asked for "track tire" recommendations. Even a beginner will get max grip on those tires in warm, dry, track conditions, once they are properly warmed up. Never, never use them on the street or wet conditions.
I agree that someone new to the track does not need R6s and perhaps a better alternative is to buy a cheaper, ultra-high performance summer tire to learn on. However, he did not say he was a novice.