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The theory of relativity. General relativity is a theory of gravitation developed by Einstein in the years 19071915. The development of general relativity began with the equivalence principle, under which the states of accelerated motion and being at rest in a gravitational field (for example when standing on the surface of the Earth) are physically identical. The upshot of this is that free fall is inertial motion; an object in free fall is falling because that is how objects move when there is no force being exerted on them, instead of this being due to the force of gravity as is the case in classical mechanics. This is incompatible with classical mechanics and special relativity because in those theories inertially moving objects cannot accelerate with respect to each other, but objects in free fall do so. To resolve this difficulty Einstein first proposed that spacetime is curved. In 1915, he devised the Einstein field equations which relate the curvature of spacetime with the mass, energy, and momentum within it.

The only one thing can help you is lot of practice and building self confidence
1. The test is of two hours duration. As nobody can do all the questions in the given time, the candidate must have the ability to pick and choose the questions that must be done.
2. start with doing the basics. Go ever each chapter and revise what you did in Class 10. Get a feel for the figures. Do the tricky questions given in question banks. Revision of the basics and doing exercises on each topic normally takes about three months.
3. fter this, one should start doing sectional tests. These are tests of 30-40 sums each, containing varied sums from all chapters. The trick is to time yourself and do one section test in 40 minutes, and checking your score. Initially one may get less score but gradually one should target a score (after deducting 1/3rd marks for each wrong answer) of above 20.
It is important to do CAT-type questions at this stage. These are not available in normal textbooks or guidebooks, but must be collected from different sources. Question banks of these are available and one may also subscribe to the notes of any of the specialized institutes that prepare for CAT.
4. The final one is mock test. Do as much as possible