Diploma

I feel one should focus on one course at a time. If you believe that you can manage both, I suggest you to take two courses in nearby fields, so that you can cover both.

Hello Arkadeep,
Aah, it's very good thought. In India, tourism business is growing by leaps and bounds. In fact as per one report, there is acute shortage of trained professionals in this field. Without any hesitation go ahead.

According to me, Diploma is the best because in class 11th and class 12th, you will study chemistry and other subjects. But, in Diploma your basics will be clear and you can get admission in B.Tech through lateral entry.

Its better to go for PCM along with Computer Science, as PCM is also important if you look for graduation in engineering after 12th. If you go for diploma than you will be very limited to computer Science course. In my view, PCMCS is better option.