Few things to remember:
1. For solving Logical reasoning questions always try to apprehend the point/inputs by using a graphical reprsentation.
Eg: for Family-Relationship kind of questions such as
1. X is Ys father
2. Y is brother of K
3. Ks mother in law is M
4. N is the only child of M
5. P is grand daughetr of Q, who is husband of M For such questions create a tree like representation using your own notations.
Tree structure for above case is shown below:
Try to form your own notations and practice them in mock tests.
Similarly tabular method can be used in other types of LR problems.