My online test series for gate marks are low after working so hard. Can anyone help me in getting good marks?

Working hard to prepare for gate is not enough you need to do smart study for obtaining good score in gate examination. If your study for gate examination is well prepared then you need practice the previous 10 years of gate solved papers. By doing this you will understand that which topics are important from the paper point of view. And you need to make a separate book of each subject that has key points in it that are important points relating the subject. And you need to revise it regularly so that you know those topics very well. And finally you practice the test series then then see what is the change in your score obtained. All the best.