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You have not mentioned about the category you belongs. However, the opening and closing ranks in year-2018 for general category for BE-CSE from DSCE were 2374 and 2665, in OBC these were 3143 and 4089, SC these were 19901 and 21670 respectively.
The course fee is about 1,37,500+30,000 per year.

The average package for B.Tech CS in SRM, Chennai is 5 to 8 lakhs.

Yes, you can do both at the same time.

There is no specific stream to join CS. ICSI has opened its door for every student. You can join CS after completing your graduation. But as per my opinion you should go for MCA or other Software courses as you may be having deep knowledge of computer. Rather rushing towards corporate world with little knowledge, in my opinion you should give your best in IT sector. But it completely depends upon your interest. You can pursue CS and have a bright future ahead.

It depends upon your area of interest. After 12th (commerce) you have many options. You can go for ACCA, CA, CS or B.Com+MBA.

Please click the link below:
https://www.shiksha.com/accounting-commerce/colleges/cs-colleges-india.

Hi, registration for CS will be open all around the year but there will be last dates for registration. You could click these links for full details of registration.
https://www.icsi.edu/student/important-dates/.

CS is the computer Science, it can be 3 years course, if you intake B.Sc in CS, and if you intake CSE B.Tech degree, then I will take 4 year.