Hello Student

P l a b is professional linguistic assessment board that conduct the exam for getting licence to practice in UK for doctors.

USmle is a lisence examination for practicing in United States.

Respect of an importance of the exam plb is the tougher examination than USmle.

Examinations he not the examination for getting job but if the candidate is qualified in respective trade for which year she is appearing for exam then there is a great scope for job as a doctor in UK

Hope the helps.