You can prepare for the entrance exam of Patna Law College using the following standard books:

A Modern Approach to Legal Aptitude by A.P. Bhardwaj – for legal reasoning

Wren & Martin – English Grammar – for English basics

Logical Reasoning by R.S. Aggarwal – for reasoning practice

Manorama Yearbook or a daily newspaper – for General Knowledge & Current Affairs

Also, practice previous years’ question papers and mock tests to understand the exam pattern.