Although relatively low mileage, your car is 12 years old so I would be concerned about the basics first.
1) Brakes - replace the brake fluid with quality stuff. Don't argue just do it. If the pads are more than 1/3 worn replace them. Check rotors - consider new ones. Don't skimp on brakes they are the part of the car that gets the most wear at the track
2) Tires - full and careful inspection. Are there any signs of unusual wear? Any bulges?
3) Oil - change it and the filter - Mobil 1
4) Wheel mounting - jack the car up, remove each wheel in turn. Are there any bad bolts? Make sure wheels are properly torqued
5) Suspension - any creaks and groans? Any play in steering? Does the car pull to one side on the highway? Common problem is front sway bar end link - check 'em
6) Clutch - replace fluid or at least have it bled.
7) Safety - are seatbelts worn out? Are seats solidly mounted? Are seatbacks solid? Remove floormats. Check passenger side too - your instructor expects his seat to be as safe as yours. Is drivers footwell carpet holed or worn? Empty the interior of all loose stuff before going to the track.
8) Junk in the trunk - clean out both trunks before you get to the track
Other than those things I would not do any modifications to the car for your first track day. There will be enough to keep your mind busy without worrying about whether this or that performance enhancement is making a difference. Remeber this is not a race.
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