Would like to share my approach for the exam, passed today on my first attempt.
1. I attend the ISC2 class and read the student guide v5 and also read the 2013 official ISC2 CSSLP CBK. Read both books twice within 2 weeks and attempts all their questions to resolidify my understanding.
2. Also read OWASP Top 10, SAFECode material to under them more.
3. During the exam, think as a security manager/PM since their questions are more testing your experience and knowledge in SDLC, security concepts and project management.
Hope it helps, good luck to all.
Study hard and earn it, you will feel a sense of satisfaction.