Hi there, i just wanted to ask that how do i overcome the fact that i almost always get disheartened if i do not get a question while preparing for jee? This way, I end up doing some other subject, or wasting a lot of time. How do i overcome this fear? I get stuck in many problems. I am an average student.

dont be disheartened . keep yourself motivate. it will help you to prepare well. also keep your spirits high and never buckle under to the negative thoughts.
now start again with your preparation .divide your time subjects .plan different strategy for different subjects. even average student can score better than anyone..
good luck!