Which s better field either btech nor bcom ca and i want know about the job and also which s the best to choose

B.Tech is a better option.

It's depend on you go with your interest follow your desire not anyone else. Both area are different and every field has further higher study and scope of job. u can do that just choose intellectually so that later on u could go ahead in future.

As per job and salary perspective I would suggest first B.Tech then CA and lastly B.Com Because there are more chances of getting high package jobs after B.Tech rather than the other two