Diploma

Pankaj, ITI is Industrial training course with it you can get admission in Diploma Lateral but not B.Tech. For admission to B.Tech, you either need a diploma of 3 year.s or you need to be 12th pass.
These days, many universities even started with integrated/ dual diploma degree (Diploma-B.Tech) where student saves 1 year as well as tension of clearing entrance tests as well as pressure of finding a new colleges. Some of these universities have good scholarship schemes too for students. These universities lay a great emphasis on placements and thus give ample placement assistance to students.
Check websites of some universities for details.
Good luck.

After completion of the course you can find employment both in the public a well as private sector.In the public sector, one can find employment with Directorates and Departments of tourism of the center and the state, guides etc, while in the private sector he/she can secure a job in a travel agency, hotel, airline, transport agency or a cargo company.
The good thing about this industry is that one can always move up the career ladder fast and establish his own agency after a few years as this industry is a comparatively new one and hence lacks experienced individuals. Top universities offering course in this field are UTM Shillong, BHU, DU, University of Mumbai & Agra university. Good luck.