Well, 德信 is not the Big 4 in Net 31. However, we can't say it is very easy to get in 德信. I konw that 15 marks can get in (First Phase that lucky draw required). In second phase, if you put in second choice, you still have chance.
However, if you select big 4 in the first choice, the most safety choice is 德信 in second. Otherwise, you will get a unbelieveable result. I just can tell you that the chance to get first choice is very low (about 25% Data just collected from the parents of kindergarten) in Net 31. It is very diffcult to make decision and fill in the form in September.
Good bye. God be with you.