Delhi University (DU)

Hi Gargi!
Along with your 12th class percentage, your choice for college is also based on the rank you scored in the entrance exam.

Admission to post-graduate courses in Mathematics leading to a Masters degree in Mathematics will be made through two modes:
Mode-I:
50% seats shall be earmarked on the basis of merit list drawn in order of preference separately at North Delhi Campus, South Delhi Campus according to conditions in Mode

Hi,
Which course do you want to take admission for in DU?

Bharati Vidyapeeth in Delhi is affiliated to GGSIPU so for lateral entry in civil engineering in Bharati Vidyapeeth you need to clear the Guru Gobind Singh Indraprastha University lateral entry entrance examination. For more details you can check the website.

No, you cannot select Hindi instead of English as English is a compulsory subject to add in the best 4 percentage. You can add your best 3 subjects with English and then calculate your best four percentage.

For a general candidate, it seems difficult but you can go through to the below-given link of DU cut-off for 2017, you'll get some idea of 2018 cut-off:
http://www.du.ac.in/du/index.php?page=cut-off-2017
Hope this helps.

Physics, chemistry, maths and one language subject (English) will be considered in best four subjects.
Hope this helps.

Yes, you can. But you have to take in account maths while calculating your best of four.

I don't think so because usually for this course, the cutoff is high but it you may consider the previous year cutoff of DU to get an idea of 2018 cut off:
http://www.du.ac.in/du/index.php?page=cut-off-2017
Please refer to the above given link.