Register children online, need to register again?

I have registered my son to school for enrol 2013 for standard one but I don't know if I need to go again register online next year. When I was first time at the school I was told that there is need to register online then print out the form to the school. I tried several times but not able to do it, but lucky my dear able to do it online.

I remember the clerk at school told one of the moms that she needs to register her daughter again next year for 2013 enrolment. I was told that there is no need to register again and find out about whether my son gets the space at the school or not on August 2012.

Anyone out there able to fill me up whether there is a need to register again next year for year 2013 enrolment of standard one.