Thank you Candyness, i'll save it as 16 bit then. Btw the topic in the link seems to be either missing or off limits to me. Well since i'm a newbie. 
I'm following the instructions attached to the test. In one of the documents said "Save as PNG-8, grayscale, 32 colours. Zip (.zip, not .rar) and upload", hence my confusion.
Now i just have to finish saving to upload it.
thanxx again.

I'm following the instructions attached to the test. In one of the documents said "Save as PNG-8, grayscale, 32 colours. Zip (.zip, not .rar) and upload", hence my confusion.
Now i just have to finish saving to upload it.
thanxx again.
It's just that if i apply 32 color bit channel on the file, whether is PSD or PNG version once i trie to save (as) it only shows like 4 extensions (psd, tiff, pbm, psb) but no PNG.
Sigh sometimes newer doesn't mean better right?