Yes, you can. It is a skill like any other skills. With proper training and practice ,you can speak English. I too learnt that way. 

2.  What are the durations for the courses?

      Durations are different  for different courses: Spoken english - 2 months, IELTS/TOFEL/OET/PTE -  2 months, Academic English- Monthly,Accent training - 15 days.

3.   Are the classes offline or online?

     Right now, all classes are conducted online.

4.   How to pay the fees?

      Fees can be paid in cash or online.