Don’t know about the gearbox but you should probably not do a remap until you’ve had a few track days under your belt. Learning is a lot easier and safer at lower power levels. The first thing to look at is brakes, fresh pads, new hi temp brake fluid (I use Motul RBF 600). Then tires, are yours in good shape? I’d recommend a fresh oil change and coolant check. Do you have a helmet? Most tracks require one with the latest certification. Tires and brakes take a beating at track days, I change my brake pads every second track day.