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Hi Srinivas, to pursue PhD you need to first prepare your research proposal and send it to the university. The research proposal must include a summary of the proposal and then the proposal in detail. You need to write the topic, reason for doing research, how the research will be beneficial to the community and the university, what is the different thing you are doing that hasn't been undertaken earlier. If the university accepts your proposal you will be asked to send in your documents after which you will get the offer letter. Then meeting all the requirements you can begin with the visa process. To approach a University you must contact the dean or the professor at the University and ask them if there is any research going on. Because its always not mentioned on the University's website whether the research in your field of interest is going on or not.
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If you want to take admission in the M.Tech level course of the engineering stream, then you'lll have to appear for a written entrance exam called GATE (Graduation Amplitude Test Examination). The examination is conducted on a yearly basis for those pass out B.Tech.Like other entrance exams, in this exam also, the candidate with highest ranks are given seats in various institutes accordingly after an interview(which is conducted by a few best colleges only).
Some of the colleges give direct admission to the students on the basis of their over all marks in all the eight semesters that span for four years in B.tech. The students of such stature are known as Management quota students and have to pay a hefty amount in lieu of donation.
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Admissions to BCA is generally given by a college according to the cut-off list prepared after receiving all applications. And to be very frank 49% is not enought o get into the top institutes or to those institutes having a history of high cut-offs. You can try to take admission at a paid seat there or go for those institutes with similar kind of cut-off percentage.
In addition to it, a few esteemed institutes in India has also a provision of entrnace exams for the same. But again they have a minimum percentage level in the eligibility criteria which unluckily is more than 49%.
My motive is not to demotivate you but to provide you with right information.
Good Luck!