How can I become a better driver?

Try not to change your driving after passing the driving test. If anything, try to become an even better driver, if not for yourself, then for the passengers in your car and the other people on the roads.

This book teaches you the basics of Advanced Driving as a learner and if you wanted to continue your training, you could do with either RoSPA or the IAM, the address of them are below:

RoSPA

Royal Society of the Prevention of Accidents
RoSPA Head Office:
RoSPA House,
28 Calthorpe Road,
Edgbaston,
Birmingham
B15 1RP, UK
Tel  +44 (0)121 248 2000

IAM

The Institute of Advanced Motorists
IAM House
510 Chiswick High Road
LONDON
W4 5RG
Tel: +44 (0) 20 8996 9600

Current or retired police officers actually examine you on your Advanced Driving test, so you must get to a good standard before you take the test.

You can buy this book for £27.42.