hey akshay,
the difference between bachelor of computer application and diploma in computer engineering is that BCA is a under graduate course which one can pursue after their 10+2 only while polytechnic is not a under graduate course it is equivalent to 10+2.,one can pursue diploma in engineering right after their 10nth and there is no such boundation that a 12th passed candidate cannot pursue diploma they can also
as BCA is a undergraduate course it holds more value however after your diploma you can do btech afterwards .
good luck!
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