Is IPMAT necessary for admission in IIM INDORE?

You haven't mentioned your highest qualification. IPMAT is the only entrance examination considered for admission to 5 year Integrated Management Course in IIM Indore. You have to appear for IPMAT after your 12th. IPMAT has 2 sections Quantitative Aptitude and Verbal Ability. Now QA has 60 marks allotted and VA has 40 marks. Each correct answer gets you 4 marks and a wrong answer takes away 1 mark in the form of negative marking. Though there has been no official release of any syllabus, based on examinations over the years, it has been concluded that few topics are the most covered,

Number system, LCM & HCF, Percentage, Quadratic Equations, Binomial Theorem, Functions, Mensuration, Permutation and Combination, Probability, Profit, Loss and Discounts, Simple and Compound Interest, Progressions, Ratio and Proportion, Mixtures and Alligations, Logarithms, Time, Speed and Distance, Time and Work, Trigonometry, Geometery, Problems on Ages, Series and Unitary Method, Set Theory, Data Interpretation and Equations.

VA:

Vocabulary, Reading Comprehension, Grammar, Sentence Rearrangement, Sentence Correction, Sentence Completion, Correct Usage of words and phrases and verbal analogies.

But for Admission to Post Graduate Management courses, CAT is the entrance examination and for that the eligibility criteria is Bachelor's degree in any discipline.