Hello Aspirant. 

That's all right Aarzoo,  if you want to change your stream from biology to foreign languages or any thing else, you can freely follow your interest but you should think twice before stepping into any field or subject. You can't just switch into different field without any prior knowledge and aim. If you want to do any thing further in any other subject,  you must know its scope,  its career option and you should have a clear mind set regarding whatever you want to do so that later in the middle of your course you should not regret for the choice of your subject and not feel lack of interest at the end. 

But if you have already made your mind setup to learn about languages and culture, I would like to share information regarding these things so that it would help you to do right for your future. 

. If you have deep in knowing the way of life, language and culture of other people, learning a foreign language is an extraordinary career option. Learning the foreign language is not only attractive in term of fulfilling the innate passion to know the culture and people but also earns you handsome salary. Knowing any foreign language alongside English adds significant value to career prospects. However,  be ready to put in a lot of effort as learning a language is painstaking tast and requires high level of concentration and a lot of hard work. 

WHAT WOULD IT COST ME?? 

Whearas fee for foreign language courses in central universities such as university of Dekhi and Jawaharlal Nehru university is minimal. Even Jawaharlal university offers attractive scholarship for students studying foreign languages. University of Delhi too offers certain scholarships based on merit and performance in university exams. Similarly, government of South Korea and Japan offer students of Korean and Japanese a number of scholarship. 

JOB PROSPECTUS: -

Academic qualification and proficiency in foreign language opens the gate for career in sectors such as tourism,  embassies, diplomatic service,  entertainment,  public relations and mass communication, international organizations, publishing,  interpretation and translation,  etc. Additionally,  various multinational coperate bodies requires candidates possing excellent language skills in French, Russian, Chinese,  German,  Japanese, Portuguese, Korean etc. Some new avenues such as online content writers,  technical translators or decoder too have come up in big way. 

PAY PACKET: -

Foreign language  professional earns attractive remuneration depending upon the work and organizations. Professional working for PR or Marketing Department of any MN can earn ₹30, 000 to ₹50, 000 per month. Teachers can earn around ₹15, 000 to ₹25, 000 a month. Translators on other hand receives ₹250 to 500 per page.  Similarly a interpreter who is paid on an hourly basis can earn ₹2000 to ₹4000 per hour,  depending on his work caliber and experience. 

5 INSTITUTES WHERE YOU CAN GO FOR LEARNING LANGUAGES: -

1- UNIVERSITY OF CALCUTTA: - If you want to learn Russian all through bachelor's level to masters level and more,  then thhis just be your place. You would like to do diploma in Arabic, Chinese, French, German,  Pali, Pursian, Russian,  Spanish, Tibetan and Urdu that are provided by this university. 

2- IGNOU SCHOOL OF FOREIGN LANGUAGE: - If you want to do PhD in French or Arabic,  then this just be your place. 

3- RAMAKRISHNA INSTITUTE OF CULTURE: - Here you'll also get courses ranging from 6 months (the communicative course) to those ranging to 4 years. 

4- ENGLISH AND FOREIGN LANGUAGE UNIVERSITY, HYDERABAD: -  provides diploma courses in many languages such as Spanish,  Russian and French or so on. 

5- THE EMBASSIES: - If you have some money to spare and if you want to learn language from the pros,  then there is no place. 

I how my answer would help to