I'll echo most of what is above.
New/fresh brake fluid, complete system flush.
New brake pads with more than 50% life left. A track oriented pad is suggested.
Jack up each corner, check for any play in the wheels, and make sure the tires have life left in them. Nothing worse than getting dinged at tech for something you could have corrected at home.
In car video and or data logging(if allowed). Much easier to learn what you can improve on if you can see it after the fact.
A safe harness/restraint system upgrade. Keeping secure to your seat pays dividends.
Take an instructor as much as you are able. Everybody seems to think it's such a big deal to go solo that they rush to do it. Take every bit of instruction you can.