The fee structure for IIMs is the same irrespective of the Category of the Candidate. They are as follows as of now. But they might change.

IIM CALCUTTA: 20.1 lakhs

IIM BANGALORE: 21 lakhs

IIM AHMEDABAD: 25 lakhs

IIM LUCKNOW: 14.16 lakhs

IIM KOZHIKODE: 17.5 lakhs

IIM INDORE: 16 lakhs

IIM SHILLONG: 19 lakhs

IIM ROHTAK: 13.8 lakhs

IIM RANCHI: 15 lakhs

IIM RAIPUR: 14.20 lakhs

IIM TIRUCHIRAPPALLI: 23.6 lakhs

IIM KASHIPUR: 13.15 lakhs

IIM UDAIPUR: 13.25 lakhs

IIM NAGPUR: 12.10 lakhs

IIM AMRITSAR: 10.25 lakhs

IIM BODH GAYA: 8.85 lakhs

IIM SIRMAUR: 10.34 lakhs

IIM VISHAKAPATNAM: 12 lakhs

IIM SAMBHALPUR: 10 lakhs

IIM JAMMU: 11.5 lakhs

But almost every IIM has scholarships available for Reserved Category Candidates. Few of them have been elaborated here:

In IIM A, all SC/ST Candidates of the Post Graduate Programmes are awarded 150 Rs per month for 10 months. Meritorious SC/ST Candidates whose annual income doesn't exceed Rs.4,50,000 are awarded Meritorious scholarships by the Government of India and you can check that at: http://www.scholarships.gov.in  A student can accept more than one scholarship or Financial aid in an academic year as long as the sponsor has no objection to it.

IIM B offers Ministry of Social Justice and Empowerment Scholarship offers scholarship to SC Candidates for National Scholarship for Higher Education for Scheduled Caste Students from Meritorious SC Students. This is to cover tution expenses in full. Apart from that, all Students with annual household income below Rs.6,00.000 are eligible to apply for financial aid. You can check the scholarships available at IIM B at: https://www.iimb.ac.in/pgp-financial-aid-scholarships

Aditya Birla Group, Ratan Tata Trust, T. Thomas Scholarship, OP Jindal Engineering & Management Scholarship are few scholarships available at IIM C for eligible Candidates based on their merit and other criteria set by the sponsors. NTPC awards merit scholarships to SC/ST Category Candidates with disabilities and Government of India sponsors merit and means scholarship for SC/ST Candidates based on their performance during the admission process. You can check that at: https://www.iimcal.ac.in/programs/pgp/scholarships-prizesawards

IIM Lucknow has quite a few scholarships but in specific to SC/ST Candidates, the Government of India awards Rs.1500 per annum to all SC/ST Candidates admitted to the programme. Eligible Candidates are also eligible for scholarships from their respective States. For the complete list of scholarships available at IIM Lucknow, please visit the official website: http://kaveri.iiml.ac.in/admission_process_indian_pgpm_fees.html

For more information, please read our article: https://bschool.careers360.com/articles/iim-fee-structure-and-seats

Approx 18 - 25 Lakhs is the fees in iim's for all category.

Thanks,
Azim

For SC and ST category, college provides financial assistance based on candidates liquidity and annual family income and scholarships are awarded.

Latest fee is 12.6lakhs  for 2 year duration PGP at IIM Shillong.


https://www.iimshillong.ac.in/admissions/pgp-admissions/#w428

List of all fees for all IIM below.
http://m.htcampus.com/article/iim-fee-structure-total-seats-management/&ved=0ahUKEwju6YuO9qrcAhUBrI8KHZUOBLEQFggmMAE&usg=AOvVaw3PL_XfOIpJTqNylf0MS7OP

IIM Shillong

Admissions Courses & Fees Placements Reviews

Shortlist

Brochure