Colleges in Coimbatore

https://www.shiksha.com/university/tamil-nadu-agricultural-university-coimbatore-23625
You will find all the true and authentic information about your college here.

Maybe you can, But you should proceed valid reason for the gap. Most the Colleges give admission for the candidate who having below 24 years.
But still your gab is 4 years and to rejoin the same course I think after 2 year gap you are eligible to rejoin still just confirm from the faculty else repeat it.

Students will have to pass their 10+2 or equivalent examination from a recognized board. And there are no entrance exam. The minimum age for admission shall be 17 years.
The cutoff marks are more than 70% marks in 12th.
Sri Krishna Arts and Science College, [SKASC] Coimbatore Fee Structure. The course fee is about INR 50,000.Minority scholarship is available, and in my department, more than ten students got scholarships.
Hostel facilities are good, and the hostel fee per month is INR 6,500 per month.The quality of Classrooms, Labs, Libraries, dining halls are very good.

Hi. For detailed information, you can see the below link
https://www.shiksha.com/college/school-of-distance-education-bharathiar-university-coimbatore-37215/course-b-sc-in-computer-science-181121
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Hi.For cut off information see below link
https://www.shiksha.com/university/bharathiar-university-coimbatore-1475/cutoff
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Hi.For admission detail information you can see below link
https://www.shiksha.com/university/bharathiar-university-coimbatore-1475/course-m-sc-in-mathematics-111981
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Anna Adarsh College for Women
Ethiraj College for Women
Jaya College of Arts and Science.

20000-25000 per year.

Yes, Chemistry has good scope till humans exist.
If you want Chemistry oriented jobs and excepting decent pay, then B.Sc. is not quite enough in my experience and knowledge.
Because you may result with an 8 to 10 hr of job which pays you 10k-15k a month.
M.Sc. has significantly more industrial value and more jobs opportunities in both the Industrial sector and the Research sector.
If you have some special contact or strong recommendation in the Industrial sector then BSc may be enough to manage tasks that require only trained but not logical thinking.