Hi ,
It depends upon the option dat you would like choose in engineering ...
You have both the options PCM and PCMB..
If you are interested in biotech engineering, biomedical engg etc then u shoud take PCMB .. and if you are intereded in electronics and computer than there is no need .. U can go wid PCM.. Thats is totally depends on the interests of yours ..
Regards
Vijay Luxmi