First of all, Dont give up! If this is something you really want to do, its worth trying again.
Is there a specific area you are consistently getting questions wrong in? For example, is it the performance charts? Is it fuel calculations? Is it weather?
Have a talk with your instructor, and ideally, get the Knowledge Deficiency Reports from both your attempts at the exam, and together with your instructor, go over them to see if there's a pattern.
Definitely take the time to learn and fully understand these areas, because they are what's letting you down. Take your time, there is no rush, either to study or to pass the exam. Take as long as you need, practise as much as you need, and when you book in for your next attempt, do it when you know you'll pass, not when you think you'll pass.
Take as much time as you need, and please - go over the areas you had trouble with, with your instructor, a cup of tea and some biscuits. Your instructor wants you to pass, too!