hi,

see if you want to gain excellence in communication skills you need to practice daily in both written and specking skills, however changing from one state to other state will not help you to make better communication, you may join part time spoken English course in local coaching institute or may learn by watching you tube lectures. also you may start writing blogs on your hobby or on your cooking skill or any of the topic which interest you. you may follow the below link to know about bsc in mathematics colleges in tamil nadu,

https://university.careers360.com/colleges/list-of-bsc-in-mathematics-degree-colleges-in-tamil-nadu?state=Tamil%20Nadu