How to prepare for IISER aptitude test in one month?

The syllabus is of class 11 and 12.
Books you can refer are :NCERT Textbooks
Arihant “Master Guide” for PCM( for solving variety of problems)
Rapid Biology for Quick review Biology
Multiple-choice questions in four subjects –- Biology, Chemistry, Mathematics and Physics with equal weightage.IISER aptitude testformat is as follows:
15 questions in each subject (total: 60)
Duration: 180 minutes
Evaluation: +3 (correct response), 0 (no response), -1 (wrong response)

Dont attempt questions you dont not know at all. Logical thinking while attempting answers is what you need. Refer to sample papers also.