The only way to become really good at something is to work hard and practice; practice; practice! The same is true of English. I know it's not always easy and you might want to do something else rather than study, but that's what commitment is all about. Doing things even when you really don't feel like it.
Let's be honest; this course is only for 50 days. So it's not like you're being asked to work hard for the rest of your life. Only 50 days. But I can promise you this; if you work as hard as you can for those 50 days then you will get the best results you've ever had in any exam. Give me 50% effort and you'll just be average. Who wants to be average? I know I don't. I always strive to be the best at whatever I do and I'm hoping you think the same way.
You can tell within minutes in a class who is going to be a leader and who is going to be a follower. But you can change your life and your career aspirations through hard work and dedication to your studies. But like everything else in life; you have a choice. What are you going to choose?