There is no such book which can make you a topper or can even make sure you crack CLAT. And yes, you can surely follow the commonly used books for CLAT like the Universal. For legal aptitude you've three things. You're provided with principle/s and then there are facts. Then you've the options from which you need to choose. The first thing to keep in mind is that the principle is the ultimate. Don't ever try to apply the general knowledge you have about the law while solving your questions. If the principle says theft is not an offence then for the 0.30 seconds you take to solve the question you must abide by that. Sometimes you've more than one principles and those times you've to abide by all of them. Now come to the options. Since you already know the answer check out only those answers where you find a Yes if that's your answer or vice versa. Try to select that option which comprises of both the fact and the principle. Speaking of legal knowledge. Prepare for it the way you prepare your GK. Know the important articles and the landmark cases. Most of the law aspirant students in the country prepare hard and take up this exam to get admission into the best law schools in India to fulfill their future professional goal. Most of colleges follow different admission procedure and accept scores of CLAT (Common Law Admission Test) or other law entrance exams for admissions. Many of these colleges have their own entrance exam pathway too. There are multiple universities in India from where you can do 5-year LL.B. Like IILM University Gurugram offers BBA LL.B. & B.A. LL.B. & LL. M. with Moot Court Internship, Seminar, Workshops, Experiential Learning along with Inter-Disciplinary Curriculum. For more details visit their website:
https://iilm.edu.in/law-admissions.