Hello aspirant!! Hope you are doing great.

Here are some list which you can refer to start your graduation after 12 in your required field-

1) St Xavier's College, Kolkata

2)Asutosh College, Kolkata

3) Maulana Azad College, Kolkata

4) Vidyasagar College, Kolkata

For more information refer to the below link-

https://university.careers360.com/colleges/list-of-bsc(hons)-in-chemistry-degree-colleges-in-kolkata

Hope this information proves to be helpful.

Good luck!!