You won't have to retake anything I don't think. You might have to do a pre-trip inspection on a bus and you'll definitely have to take the written endorsement tests. Anything you've already taken is still good.
A pre-trip inspection is a thorough inspection of the truck completed before driving for the first time each day.
Federal and state laws require that drivers inspect their vehicles. Federal and state inspectors also may inspect your vehicles. If they judge a vehicle to be unsafe, they will put it “out of service” until it is repaired.
You will need to take the written & skills tests for passenger & school bus.
This includes pre-trip and road test.
All your other tests & endorsements remain intact without having to re-test.
Rick
In Pennsylvania, the "P" endorsement is a simple 15 or 20 question test at the DMV. However, the "S" endorsement requires a written test, attending a school bus class with minimum number of hours classroom training( like 2 or 3 evenings for around 12 hours total), and the complete pretrip/skills/road test done in a school bus. School bus even has it's own manual. Classroom portion essentially deals with how to properly pick up/discharge students, RR crossings, special needs students, and behavioral issues. Not really difficult and school bus companies usually (around here) provide the training for free. Suspect other states are similar.
The state agency that handles everything related to your driver's licences, including testing, issuance, transfers, and revocation.
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If I want to drive a school bus, and have my cdl A, can I just take the P and S endorsement test and the road test? Or do I have to take the entire general knowledge written test all over again fresh?
CDL:
Commercial Driver's License (CDL)
A CDL is required to drive any of the following vehicles: