Thank you very much for the advices. I'm very new to the area of giftedness. Though we've been noticing traits and skills that make our son different from others, we always thought it is how thing is. (You have bright kid in one end, you gotta except what come with it. We were just thankful then that he's not too bright to the point that the trade off won't allow him to live normally. )
Only recently we started him in school and the social and emotional issues became apparent. I looked up articles for help and came across the term "gifted." For the first time, all the puzzle pieces came together. When we left school, involuntarily, the principle suggested us to open up about getting him tested for giftedness. I don't find the need or use for it then because I'm not sure how I feel about putting label on him.
As I prepared homeschooling materials I noticed many gifted organizations or school required test results for participation. The name that came up all the time is WPPSI-III. With very little knowledge, I assumed it must be the best test for kid younger than 6 year old taken that it's one on one assessment as compare to SB-V. I just fixate on it and didn't explore any other options, being kinda stupid I shall say. Your words of advice put me where I should be and broaden the point of view. I can't thank you enough.
By the way, my son is turning 6 in April.