Dear Kuldeep, what has paid off to me was to have a clearcut structure of the paper. I am used to following the IMRAD model: Introduction, Methods and Material, Results, Analysis, and Discussion. This way, you can easily control your writing and avoid lack of structuring. I suggest you have a look there: Understanding the IMRAD Model | English 112: Exposition and Persuasion (lumenlearning.com). Good luck!