IIM Indore - Indian Institute of Management

I would encourage you to get your NCERTs and RS Agarwal sorted out for reasoning and competitive exam. For Verbal Ability, refer to Wren & Martin or some primer like McGraw Hill or Pearson. Solve a lot of mock tests and practice a lot of questions.
For the interview, prepare well about your backgrou

To get into IIM, Indore or Ahmedabad, you can give CAT exam for 2 year PGDM course. IIM, Indore also runs 5-year IPM course (last 2 years are held along with PGDM students), which you can join after 12th class. You can also enter through GMAT score if you are an NRI.

Well, it will be stupid, if I say that a job will be guaranteed, because it will all depend on an individual's caliber and performance, but yes such exposure and training that you will get from IPM will surely enhance the probability of this thing manifolds.

Yes, no particular preparation is required for IPM as such, if the concepts of an individual is clear. So, both the preparations can be done simultaneously.

Yes, certain banks easily issue education loan for any IIM.

Yes, of course. It is one of the most rapidly growing courses in the current scenario and is continuously attaining excellence.

The following are the top '6' (they might vary a little according to different sources):
IIM Ahmedabad
IIM Bangalore
IIM Calcutta
IIM Lucknow
IIM Kozikode
IIM Indore
To answer your second question, of course it is possible. You'll have to first take CAT.

No. You probably won’t be eligible for that. People apply for IPM immediately after completing their 12th. If you want to do an MBA, apply for the PGP course and for that you will have to appear for CAT.

Integrated Programme in Management (IPM) - IIM Indore, the first of its kind in India launched by IIM Indore in 2011.
IPM, A five-year Integrated Program in Management is for students passing out from Class XII.
One can get admission into IPM by taking IPMAT - Integrated Programme in Management Aptit

If you want to pursue MBA after graduation, I believe this is the right time to take IPM in IIM, Indore.