As you want to get admission in IIT Bombay and for the same asking for OBC cut off for JEE exam , so here I am telling last year cut off for an idea :

Course Name GEO GEC OBCO OBCC SCO SCC STO STC
Aerospace Engineering 164 1852 110 847 119 454 93 228
Chemical Engineering 678 1405 506 840 178 556 170 343
Civil Engineering 588 1899 252 835 105 431 3 131
Computer Science and Engineering 1 51 1 38 1 26 1 13
Electrical Engineering 28 168 3 95 13 65 4 18
Engineering Physics 335 943 205 916 35 340 197 367
Mechanical Engineering 35 640 67 272 24 140 23 52
Metallurgical Engineering and Materials Science 1720 2776 1018 1602 582 894 360 635

Departments and center -
Department of Aerospace Engineering
Department of Bio sciences and Bio engineering
Department of Chemical Engineering
Department of Chemistry
Department of Civil Engineering
Department of Computer Science & Engineering
Department of Earth Sciences
Department of Electrical Engineering
Department of Energy Science and Engineering
Department of Humanities & Social Science
Department of Industrial Design Center
Department of Mathematics
Department of Mechanical Engineering
Department of Metallurgical Engineering & Materials Science
Department of Physics
Centre for Research in Nanotechnology and Science
Centre for Aerospace Systems Design and Engineering
Centre for Distance Engineering education Programmme
Centre for Environmental Science and Engineering
Centre of Studies in Resources Engineering
Centre for Technology Alternatives for Rural Areas
Centre for Formal Design and Verification of the Software
Centre for Urban Science and Engineering
Sophisticated Analytical Instrument Facility
Industrial Design Centre

Address
Indian Institute of Technology, Bombay
Powai
Mumbai
Maharashtra
Country : India
Contact No : 022-25722545
Contact Email : dean.aa@iitb.ac.in