UK student visitor refused, what to do next? [closed]

I am 21, Vietnamese and have been accepted for the 26-week-long General English course in St Giles International, Brighton, UK. I have applied to the UK Visas and Immigration office in Vietnam. I have asked for short term student visitor visa and got refused. Now I am reapplying.

Exact wording of the refusal letter quoted here:

I have refused your application for a visit visa because I am not satisfied that you meet the requirements of paragraph A57 of Appendix V: Immigration rules for Visitor because:

• You have said that you will travel to the UK for a period of 26 weeks, to study a general English course. You have said that upon completion of the course you will return to Vietnam looking for a better job. You appear to have completed your full time studies in Vietnam in 2013, and you have been working in administration role since May 2014. You have not sought to continue your studies in your home country since 2013. and you have not undertaken any English course previously, outside of your high school studies. You are employed and receive a monthly income of VND 5,000,000 (GBP 144.70). Of your GBP 144.70 income you spent GBP 100 on living costs. You have said that your study in the UK will cost you GBP 16,000. Therefore I am unclear why you would elected to travel; to the UK now, at the course involved - when courses are available in Vietnam, considerably cheaper.
• As evidence of funds available for your trip you have presented a Sacombank savings book, on 14/08/2015 you credited VND 800,000,000 to this account, this is equal to GBP 23,151, and equates to over 13 years total income, before considering your living costs. As such, I am not satisfied of the origin of these funds, or if they are genuinely available to support your visit now. In light of the above, noting the costs involved, in fact you have not sought to study English previously, and there is no evidence that completion of this course would offer you better employment in Vietnam. Coupled the fact that I am not satisfied that the funds a genuinely available to support you visit means I am not satisfied that you intend to leave the UK at the end of the study. Furthermore, I am not satisfied you have enough funds to support your return journey, or that you will be maintained and adequately accommodated out of funds available to you.

First of all, after completing high school, I was not able to make it to a college or university. I got the job as a arrangement of my father with his friend's company. I could live quite easily without the salary thanks to my parents' financial support. In another word, all I needed was just a so called job, no matter how much it would pay me. After a year of being bored of the jobs as well as family dependence, with my parents' encouragement, I decided to go to study abroad to improve my knowledge and experience. I simply think that if I continue being in my country, no matter how much I want to do it, my family will give me everything I need when I am in trouble. And more than to become independent, I want to get a job with my very own sources when I return. I think the course will afford me that.

The funds for my course, obviously, came from my parent. And if the UK Immigration officers have doubt about my return or my bond to my hometown which can assure my return (such as a high salary job or real estate ownership) I just don't know what to show to convince them.

At the moment, all I think of to add to my reapplication are my parents' income statements (though I am not quite sure if it will help because legally, I have been no longer their dependant). Just so you know, I've already had my bank statement, employment description, return ticket booking, study record etc. I desperately want this, and even much more after the refusal, as I don't want to be called parasite any more.

What should I prepare and do to reapply?

I'm so afraid of being refused again and that would be the end of all of this because every time of being refused, it's only getting harder and harder to apply next time.