The ISE B1 English exam (that cab drivers in London have to pass to renew their Private Hire Driver's Licence, before 31st March 2017) is a test with Reading, Writing, Listening and Speaking questions to test your overall level of English language skills.
There are 2 parts. First is the Reading and writing test - this will take 2 hours.
Next is the Speaking and Listening test. This is much shorter and will only last for 18 minutes.
ISE B1 Test: Reading and Writing tasks
In the reading and writing part of the test, there are 4 separate tasks.