Should I continue my study after a long gap in grade 8 more than 5 years?

This is such a bizarre question that you really have to explain your situation. For starters, it depends on what country you are in. Then it depends on what you mean by "my study". If you are in USA and "study" means "public school diploma" then the question becomes meaningless because schooling is inflicted upon the young and you are not young any more. Besides that, your writing is better than most public school graduates, so you may as well study something else, on your own.

If you are in some other country, the answer might be different.