If your style is more working section by section, here are some tips for each section.
Abstract/Executive Summary: ECPublishing had a great insight into the importance of your abstract:
Make sure your abstract and title truly reflect the content of your paper and are written well. You need to sell your paper and its significance. We can’t rewrite your abstract to make it more attractive to reviewers; you need to make it concise and full of impact.
Although this is the first thing read by most readers, it is often the last thing written. Many people are afraid to give the results/conclusions of the paper because they want others to read it. However, without results/conclusions, a reader will not know if the paper is relevant. In fact, I never download a paper where I'm not sure what the results are. I tie the abstract closely with the conclusion of a paper. It forces the conclusion to be focused and it makes the abstract relevant to your paper's message. Another way to think of it is: If someone were to ask you what your paper was about and what impact it has for researchers in 5 sentences, what would you say? This is why most people say to write the abstract last.
One of the main problems in revisions, however, is that your message/conclusions and how you word them may change. If you have a teacher/supervisor/editor who wants you to shift focus, you may rewrite your conclusion. Remember to revise your abstract also.