Good suggestion Al.
In addition, you have to make yourself physically & mentally fit, so that you have the energy to study and able to absorb the knowledge easily.
Daily jogging & taking Gingko Biloba vitamins for mental focus & memory are my recommendations during exam preparations.
On the day of examination, bring "Red Bull" energy drink. Take it after the first 2hrs (Fundamentals-150 questions), so that you have the energy for the remaining 4hrs.
The above are proven effective to me
American English is not my native language & my background is NDT technician before AWS-CWI. But I passed them all on first attempt.
AWS-CWI (1994) - self study
API 570 (1998) - attended course provided by Hellier
API 653 (2002) - attended course provided locally
API 510 (2003) - attended course provided locally
AWS-SCWI (2006) - self study
~Joey~