Diploma
First it is important to choose the country and institute. The eligibility criteria may vary in various colleges. In general you will need to appear in IELTS (TOEFL in some countries).
You can even check the respective official websites of colleges you are interested in to know the detailed admission
Are you already pursuing the diploma?
Also, it depends on your interest and potential but as per my view I would suggest you to do regular schooling till 12th then go for Jee and other entrances then get admission in B.Tech course in decent institute as if you go for
Yes, you can join B.Tech program after completing your diploma in mechanical engineering. Because diploma is not sufficient there is a lateral entry to pursue engineering.
Lateral entry scheme is intended to admit meritorious diploma holders to the second year of the B.Tech courses to acquire a degree in engineering.
Yes there are. After 12th, following are the diplomas you can consider in software engineering:
Few institutes which provide diploma in software
The sample papers are not easily available for DEEE branch. You can check on the official site of the university or check the availability in near by book stores specially the ones who keep competition preparation material.
Good Luck.
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