Tax Relief - PTPTN Deposit

Anyone thinking of getting more tax relief by deposit RM into PTPTN (children education fund)?

I just receive the annual statement from PTPTN, for year 2011 and year 2012, together...

2011 RM3,198.00 + RM103.94..... return is 3.25%
2012 RM3301.94 + RM123.82 ..... return is 3.75%

Emm... return not too bad, also not good enough. i remember that was a year, return is only 2%....

Now, have to think twice before deposit more for the purpose of tax relief...