Ramjas College, University of Delhi

95% is not enough if you belong to general category, So you have to improve this up to 97% of marks.

Hansraj College can be counted as one of the best institutes for B.Sc. Computer Science (honors). The well qualifies and dedicated faculty provides guidance in academics. Exposure to emerging trends and technology is given to aid the growth of students. Leading companies visit college for placement offers.

Yes you have definite chances of getting into a good college in North college. First of all fix a seat in first cutoff and then you can wait for more cutoff and when gets chance of a good college then shift into that college.
Don't worry you can get into north campus college. Infact in 1st cutoff you can get into it.
For getting detailed analysis of your chances in a particular college go to to the DU portal and check Previous year cutoffs.

No, you cannot do that. Mathematics is compulsory in this course. Check the eligibility criteria on DU website.