hello student,

you can apply for Bachelor of Arts and one of the subject you can opt as English. This is the most considerable option for your career for fluency in English.

if you take the English version of any of the course then it would take nearly 6-7 months to learn just a basic.

Therefore, I would suggest you not to change your medium as it would make your education difficult. you can take English speaking courses firstly and then apply for  further english medium courses.