According to FAQ of PCC Course given by ICAI, PCC registration validation is 5 years from the date of registration.
On this base 7 attempts will be available in 5 years validation. It is because due to following reason
For Example : If a Student Registered in JANUARY 2007 , his Registration Validation will be til JANUARY 2012.
Now CALCULATE , The Student Registered in JANUARY 2007 will get Eligible to WRITE First Attempt in
NOVEMBER 2008,then
MAY 2009,
NOVEMBER 2009,
MAY 2010,
NOVEMBER 2010.
MAY 2011,
NOVEMBER 2011
according to above it is proved there are 7 attempts available for every PCC Registered Student .
After Expiry of 5 Years validation you have to re register again.
It is my analysis and given clearly in the following link of ICAI.
thanx aloooooooooooooooooooooooooooooooooooooooooot 
CAclubindia
