Hello Utkarsh, I am glad to hear, that you have interest in LAW... See, to get into TOP National Law University (NLU) within a limited time period, you need to give maximum time to your preparation and have to score really marks ...

CLAT (Common Law Admission Test) Syllabus you can find online, i can suggest you come tips - 

1. Solve last 5 years question paper

2. Solve mock paper (As much as possible)

3. Books - Quantitative Aptitude of RS Aggarwal, English: Word Power Made Easy by Norman Lewis, Legal Aptitude and Legal Reasoning by A.P. Bhardawaj, GK: Objective General Knowledge by Arihant Publications 

All the Best

you can do so by making certain efforts and by studying smartly.  First thing you can do is study the pattern of pervious year exams patiently and extraxt the idea of questions which are oftenly asked in it.  After analysing and understanding the exam pattern then you need to realise the audacity of time and thus give maximum of it to study the same with full concentration and best efforts.  With this you need to work upon your weakness and strengths and do preparation according to it.  you should manage your time efficiently and effectively.  for example if you are from science background then you might find the maths section comparatively easier as to the other so you should practise more of it so that you could make better best.

Then analyse how much time you should give to each section according to the weightage and your capabilities.