Filling out the NHRA forms and doing the required drivers test in the car at the track with the required signature from the other drivers that witness your testing and runs
I'm a commercial pilot who has not flown in over 13 yrs now and I was surprised that NHRA and the FAA had loosen up the medical exam requirements several years back
You can call your local NHRA tech director to verify this information on when the medical will be required, it is not require for S/P, S/G and maybe S/C now