CBSE 12th

Yes, you can expect some good engineering colleges. Check the link given below for colleges based on your TS EAMCET rank-
https://www.shiksha.com/b-tech/resources/ts-eamcet-college-predictor.

After 12th, engineering is the more preferred option, as you have a very good score in 12th. Give an attempt for JEE or other exams like BITSAT, VITEEE, TS, EAMCET for good engineering colleges. Also, check the below link for other career options after 12th-
https://www.shiksha.com/careers

Choose a stream of your interest. If Science, then go for B.Sc. Go for B.A. for bachelors in arts.
If politics is the interest then opt for Political Science/ Economics/Sociology.
B.A. is also a great option if you are looking for MBA after graduation.
Check the below link for career options after 12th-
https://www.shiksha.com/careers.

JEE Mains 2018 College Predictor
Use your JEE Mains 2018 rank to see where you can get admission at the link provided below:
See the courses, colleges & rounds you may crack
The result is based on admissions data of JEE Mains 2017
Get resources & insights on colleges & courses
https://www.shiksha.com/b-tech/resources/jee-mains-college-predictor.

BBA will help you. But, firstly, prepare a list of colleges and get all the details about them like fee structure and entrances. Also, check nearby locality. Google will help you in a better way.
Good luck.

Andhra Pradesh-EAMCET 2018 College Predictor
Use your Andhra Pradesh-EAMCET 2018 rank to see where you can get admission at the link provided below:
See the courses, colleges & rounds you may crack
The result is based on admissions data of Andhra Pradesh-EAMCET 2017
Get resources & insights on colleges & courses
https://www.shiksha.com/b-tech/resources/ap-eamcet-college-predictor.

Andhra Pradesh-EAMCET 2018 College Predictor
Use your Andhra Pradesh-EAMCET 2018 rank to see where you can get admission at the link provided below:
See the courses, colleges & rounds you may crack
The result is based on admissions data of Andhra Pradesh-EAMCET 2017
Get resources & insights on colleges & courses
https://www.shiksha.com/b-tech/resources/ap-eamcet-college-predictor.

Look, after 12th, you have to do B.Sc. and then M.Sc.
Now, M.Sc. in Economics is a very good course and has a good future too, so you can opt for it.

It depends on the grade of college and course you are looking forward to get into. North campus colleges would require a minimum of 90%. In South campus, the cut-offs are usually lower compared to North campus colleges. You can get the accurate list of DU colleges that you can take admission into on the basis of your XIIth percentage at the following University of Delhi website.

Is it Jadavpur University-JU? Eligibility for B.Arch is -
No Candidate, with less than 50% marks in aggregate, shall be admitted to the architecture course unless he/she has passed an examination at the end of new 10+2 scheme of Senior School Certificate Examination or equivalent with Mathematics as a subject of examinations at the 10+2 level and passed NATA examination. NATA is the entrance exam, one need to attempt.