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I'm sharing with you the list of books considered best for CAT exam preparation:
1. Quantitative Aptitude for the CAT Common Admission Test by Arun Sharma for a simple and easily understanding purpose.
2. Quantitative Aptitude for the CAT Common Admission Test and Data Interpretation by Nishit Sinha for an advanced purpose.
3. A Modern approach to verbal and non-verbal reasoning by R. S. Aggarwal.
4. How to Prepare for Verbal Ability and Reading Comprehension for the CAT Common Admission Test by Meenakshi Upadhyay and Arun Sharma.
5. Quantitative Aptitude Quantum CAT Common Admission Test for Admission into IIMs by Sarvesh K. Verma.
The hours of study really depends on how strong your base is and how much you grasp.

Hi Kuldeep,
TOEFL has four sections namely reading, writing, listening and speaking. There is no particular subject or syllabus you need to refer to. It is all about practice. Refer to TOEFL books and downloadable materials and practice improving your comprehension, paraphrasing passages etc. Read short articles, news, journals regularly. Get yourself acquainted to reading and answering questions on a computer, hence it is important to take regular practice tests.
Practice or mock tests will also help you understand your current level of improvement and areas you have to improve on. Check the ets.or/TOEFL website and check for sample and practice test materials. At least 3 to 6 months would be required for the preparation so schedule your routine accordingly. Most importantly don't forget to take breaks and relax.