Indian Institute of Technology, Delhi

Chances are less at this score. You can apply for IIT-Roorkee, IIT-KGP, IIT-Madras, IIT-Kanpur. IIT-B/D have a higher cut-off, unless you have a good work/academic profile.

It will be very difficult as the cutoff is likely to be around 92 percentile.

The cut off is decided on different conditions. There are total five round for different categories.

Yes, you should get a call from IIT Delhi the cutoff for last year was around 96 or 97percentile in CAT. It will be a borderline case. You can also apply for:
MDI Gurgaon
NITIE Mumbai
XIMB Bhubaneshwar.

You have scored 43 based on which category you belong to whether SC/ST or OBC.You must see whether you qualify for JEE advance and sit for the exam and crack it.

CSE at IIT Delhi is ranked No 2 in India after IIT B. Candidates who top in JEE advanced are only able to join B Tech CSE at IIT D.

Non engineering graduates are eligible to seek admission in IIT-D. Please refer to following link for eligibility criteria to seek admission in MBA at IIT-D:- http://dms.iitd.ac.in/mba-full-admission.html

Shortling of candidates for admission in IIT Delhi MBA programmes is based on CAT score only. Shortlisted candidates are invited for a group discussion and interview.

Source from IIT Delhi
Vision of the Department
The Department of Mathematics strives to be recognized for excellence among academic institutions in India and abroad. The Department wishes to focus on providing a comprehensive curriculum at undergraduate and postgraduate levels, relevant research and career opportunities in India and abroad.
Mission and Program Goals for the Next Decade
The Department plans to induct new faculty to enhance/strengthen the research as new faculties are a major source of new and fresh ideas in contemporary areas. The Department plans to start the Integrated M.Sc. + Ph.D. program.

You must aim for minimum 90 percentile for IIT Delhi as it's a premier institution and cutoff for general category goes upto 98. Work experience and added certification courses are given due weightage.