2382 is an 'open book' exam
This means that you get a copy of BS7671 to take with you into the exam. All of the answers to the questions are in the BS7671 book.
So you need to learn the STRUCTURE of the book, what sections relate to waht part of electrical work and how to find them in the CONTENTS and the INDEX.
So, if you got a question like:"What is the minimum cross-sectional area of a buried copper earth conductor that is protected against corrosion by a sheath but is not protected against mechanical damage."
Underneath the question you'll be given 4 possible answers, only one is correct.
Lets say the 4 possible answers are
a. 2.5mm
b. 10mm
c. 16mm
d. 25mm
You would go to the INDEX (at the back of the bokk). Look for EARTHING CONDUCTORS, SELECTION
and the index gives you the section that you need: 542.3
When you turn to that section you'll see the answer is given in Table 54.1
The correct answer is 16mm²
So you select answer c and then go to the next question.
It is not so that you KNOW the answer; the exam is to find out is you know WHERE TO FIND THE ANSWER.
You should know about all of this from your course.
Go and buy this book.
http://www.amazon.co.uk/IET-Wiring-...2320/ref=sr_1_1?ie=UTF8&qid=1347208755&sr=8-1