IIM

You must give CAT or GMAT to get into IIM-Trichy.

yes you are . as only iim Indore is the one which conducts Integrated Program in management (IPM) which is after 12th and is of 5 years . you have to give IPMAT test , if you qualify then you will be called for personal interview . then finally the merit list is announced . remember there are only 120 seats for IPM and evey year around 18000-20000 give written exam and around 1200-1300 gets qualified for PI .

MBA is a post graduate course. You first have to complete an Under graduate degree then qualify CAT exam to get into IIMs. Any degree completed with minimum 50% allows you to sit for CAT. If you're so keen on doing MBA from IIM, there is another way. IIM-Indore has started a 5yr integrated programme in management(IPM) that give you 3yrs of BBA and 2yrs of MBA. If you clear IPMAT exam after 12th, you get selected to do IPM. This exam is a shortcut where you skip CAT.

Arun sharma books are best for all 3 segments I.e quant, verbal, logical. You can also refer to study material of some coaching institute

no necessary. bt,min % must be 60% above.
and try cat 95% above.

IIM cannot help you there. IIMs only serve post graduate courses. You are talkin about undergraduate programme Economic Hons. After completing UG programme, you can sit for compititive exams to get into IIM for PG courses like MBA.