Which subject is good PCM or PCB?

Both are good options. But please understand that PCM is Engineering Combination and PCB is combination for Medical /Allied Health . I would like to explain this in detail. As a HSc holder with PCM, you can go for any engineering, technological and applied Science courses except Bio Technology, Bio

Both are good... But matter is that " in which you are good "... :)

it totally depends on your interest.

depends on What u want to do ..both are good..choose according to Your interest and career.

Both r best.... It's totally depends upon u..n Your interests.