If you Want to Start Preparing For CAT without Coaching then You need to take a Dicision and be stick to it. So, first you need to plan accordingly for planning
1. Do SWOT to know your strength and weakness. for doing swat analysis. first write a mock test paper and Analyse a score and by analysing it Figure out your Strength and weakness and then plan accordingly
2. Allocate Some time Regularly for your CAT prepration.
3. For Practice you Can use This (EduRev) platform only.
and For Strengthening your Concept you can go for any Good Online Coaching platform which will provide you Best content designed for CAT and Other MBA entrance exam. I would Recommend Unacademy as it Provides live Class from India's top educator in your device at the comfort of your home. You can also go For Career Launcher, Byju's or any other Online platform but these are little costly.
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4. You can Also Take Infinity membership on this platform and complete rest of things on Free Content on Unacademy.
5. The Recommend books Are
1. Arun Sharma for CAT specially Quant
2. RS Agrawal Arithmetic
3. Word Power Made Easy
4. CL Study Material
5. Logical reasoning RS Agrawal
6. Verbal Ability Arun Sharma and Meenakshi Upadhyay