Am I eligible to sit for UPSC exam after completing B.Tech (Computer Science Engineering)

UPSC is centralized body which conduct various exams for various fields. you can apply for various UPSC exams after completing B.Tech from Amity University. you can also apply while studying in final year of your B.Tech.
here is the list of exams you can apply after B.Tech:
>>Civil Services
>>IES
>>CDS
>>IFS
>>CPF

for Civil Services, IES, IFS your age should be within 21 years to 32 years.
for CPF your age should be within 20 years to 25 years.
Age Limit for CDS:
for INA: 19 to 22 years
for IAF: 19 to 23 years
for IMA: 19 to 24 years
for OTA: 19 to 25 years

in all the above exams except CDS exam there is relaxation in upper age upto 3 years for OBC and 5 years for SC/St candidates.

you have to apply for the exam online on given link:
http://upsconline.nic.in/