Set alarms to remind yourself about pending tasks and the time they need to be done
Make a to-do list in the morning and prioritize the task as per their urgency.
Follow the five-minute rule. If a work can be completed in five minutes, do it now.
You must finish the hardest task first. A pending hard task may give you an ending headache, hampering other work.
Follow Pomodoro technique - work for 25 minutes and then take a 5-minute break. Repeat again.
You must divide tasks into smaller, manageable parts and then do it accordingly.
Social media is a time killer. Facebook, Twitter and Instagram can wait but not the work or your research paper.