Driver and Vehicle Standards Agency. This agency tests UK drivers, MOT testers, and driving instructors. It ensures bus and truck safety.
DVSA monitors car recalls and conducts roadside driver exams. Transport funds this executive agency. 

It also ensures the safety of buses and vehicles on the road. You should join a driving school to pass the exam. 

Furthermore, the DVSA monitors vehicle recalls and conducts roadside checks on drivers. The Department of Transport funds this executive agency.

You can google your nearest driving school. For example:

If you live in Greenford: Google Driving lessons in Greenford

If you live in west Drayton: Google driving lessons in West drayton

If you live in in Harrow: Google driving lessons in harrow

Driving Tests
DVLA issues licences, but DVSA administers the test. DVSA hires driving test examiners exclusively. Cars, emergency service vehicles, and articulated lorries are tested.
For driving test questions, contact the DVSA. Note that the DVSA only administers practical driving examinations. Pearson administers DVSA theoretical tests.
Driving teachers
UK driving instructors must be DVSA-approved. Train and pass three DVSA examinations. ADI registration follows.
Non-DVSA driving testers
Note that DVSA solely appoints most driving test examiners. It's conditional.
The DVSA may allow an organisation to hire its own driving testers.
Car recalls
The DVSA recalls vehicles, too. Remember that the DVSA is behind car model or part recalls.
Check for safety recalls online with the DVSA. Check horseboxes and motor trikes also. Tyres and seats can also be checked.
Roadworthiness and MOTs
MOT tests by DVSA evaluate UK automobiles. Most individuals don't aware that the DVSA runs these exams since independent enterprises do them. But, you must finish a training curriculum and DVSA tests to become a MOT tester.
The DVSA ensures that your car's roadworthiness is in excellent shape. The DVSA handles your trips to test centres, certified garages, and MOT tests. Check your vehicle's log book (V5C) for the next MOT test date. You may be pulled over for a roadworthiness check at any time.
DVSA officers will check your driver's licence, tachograph records, mechanical problems, vehicle load, and roadworthiness when you're pulled over. If a uniformed DVSA officer instructs you to stop, you can be fined. Beware of bright yellow jackets and automobiles!
If the DVSA finds a significant car problem, it may potentially ban your driving. You can't drive till the problem is fixed. If you receive an instant ban, your automobile may be inoperable. You have 10 days to fix it if the ban is delayed.
Trailers, HGVs, and buses undergo annual DVSA testing. DVSA-approved testing facilities or the test station can book your exam.
DVSA Duties
British roads are among the safest in the world, but every accident and death brings damage, interruption, and anguish.
DVSA checks vehicle roadworthiness and driver skills to prevent this. DVSA wants safer cars, drivers, and trips.
DVSA duties:
Giving beginners theory and practical driving tests for cars, specialty vehicles, buses, coaches, trucks, and motorbikes.
Road test vehicles, coaches, and buses.
Monitoring manufacturing and accessory recalls and ensuring manufacturers resolve issues swiftly.
Checking commercial drivers' cars and compliance with safety laws on the road.
certifying MOT testers and MOT centres.
approving motorbike and driving teachers and assuring proper training.
Authorizing Driver Certificate of Professional Competence training for lorry and coach drivers.
Drink-drive rehabilitation classes.
DVSA is not DVLA.
DVSA and DVLA may confuse new drivers. Driver and Vehicle Licensing Agency (DVLA) predates DVSA. The Driver and Vehicle Licensing Centre was formed in 1965 and renamed DVLA in 1990. DVSA handles standards, DVLA licences. When asking questions, you should know their roles.