I feel that you have the writing skills required to craft a spectacular essay. However, you need to focus on showing more than telling. As of now, your essay is more of a list of achievements. Content like this belongs in a resume, not an essay. An essay should show traits or characteristics. Think about how many fellow students you know that have the same academic achievements as you. What sets you apart? Do you have a particular goal in life that you can achieve by using education in the UK as a stepping stone? While it is okay to mention achievements, the bulk of your essay should discuss an overall life plan you have whose success is facilitated by an extensive amount of computer science knowledge.
I love the quote you mentioned at the end of your essay; however, I think it would work better as an introduction. After mentioning the quote, discuss your plan for saving society. Provide examples that prove you have what it takes to achieve your goals (personality traits). Show how you will use the education that you will receive if accepted in order to facilitate your plan to help society with your computer science skills.
Essentially, you need to shift your essay from a list of accomplishments to a great plan that happens to include education your university of choice. While a university can easily deny the application of an intelligent individual, it is much harder (if not impossible) to deny the application of an intelligent, motivated individual who has one-of-a-kind goals and aspirations.
Instead of stating the completion of your first episode of life, say that you have completed the first part of some sort of master plan.
Set yourself apart from the crowd. I know you can do it.
Here are a few minor changes that I think could improve upon the existing content you have, provided you include it within the next revision of your essay.
The school motto 'Never Give In' became one of my authentic principles of life and stayed with me as I went on to join Delhi Public School, R.K. Puram, ranked first in academics across India. Being fascinated about the progression in computer program language, I often recall the moments when l used to ponder about the transformation of computer science through its evolution from that of a room sized computer to a pocket sized Smartphone. Computer science is like a maze to me, the deeper you go into it, the more it enamours you.
Remove "ranked first in academics across India". The fact that you came from a superior school is irrelevant to you as a person. While the transformation of computer size is fascinating, it seems as if you are attributing the change in size to a change in the programming language. The change in computer size is due to hardware, not computer code. Rephrase this a bit, and if it works well in a revised essay utilizing my advice above, feel free to implement it.
Solid essay so far. Just remember that there are so many aspiring computer scientists who have the exact same academic record as you do. In such a highly competitive atmosphere, you need to set yourself apart from the crowd by including information relevant to life as a whole rather than just the narrow realm of academia and how it is so interesting to you.
Good luck! I'm excited to see how the final copy of your essay turns out, so if you revise it, please post it again.