Easy enough.
1. Acquire a high powered rifle, i would recommend the Remington 700 SPS in 7mm magnum for this job. Scope of your choice, id recommend Leupold
2. Find tallish building with good sight lines to your car's usual parking spot.
3. Wait until you see the person messing with your car.
4. Shoot the target in the arm, if you know the person, shoot them in the arm that they use ( aka are they right or left handed ), if you do not know them, shoot their right arm.
5a. If you know the classmate, then justice is served.
5b. If you did not know them, look for the classmate with a missing right arm.
Justice, Spyder style.