Before the interview:                               

Research the organisation, check the company website and search them on the internet

If changing career/industry, research the industry

Prepare answers to standard interview questions

Make sure you know the name of the person or people interviewing you

Check the format of the interview

Check the formality of the interview and prepare an interview outfit

Print out spare copies of your CV to take with you

Re-read CV

Plan the journey to the interview

Check the news/traffic reports to make sure there are no problems

Take a contact number for the company with you in case there are any problems

At the interview:

Switch off mobile phone

Ask when you can expect to hear back

After the interview:

If appropriate, email to thank the interviewer for the opportunity

If unsuccessful, contact the interviewer and ask for constructive criticism/feedback