You can appear for an CISSP exam three times in a calendar year. but you will need to pay $ each time you attempt
From (ISC)2's website:
You can sit for (ISC)² exams up to three times within a 12-month period.
For the CISSP-CAT, CISSP, SSCP, CAP, CSSLP, ISSAP, ISSEP and ISSMP:
For the CCSP and HCISPP:
Each time you sit, I believe you wil need to pay the appropriate fee.
As with all certification exams the more experience, work practice combined with the sheer number of prior exam sittings will easily prepare you to pass most any test. Something like practice makes perfect seems to work well here as well.
Go into the exam well practiced and prepared and you will have no problems passing the exam.