Hello,
You mostly get admission on the basis of your 12th percentage in delhi university for ug courses .There are some courses for which university conducts separate entrance examination.for admission in the pg courses one needs to appear for the entrance exam conducted by the university.
If you talk about the top three colleges of delhi university then these are the names:
For science-

• St stephens college
• Hindu college
• Miranda house

For commerce-

• Srcc
• Lsrc
• Dcac

For better knowledge browse the following link-http://www.university.careers360.com/articles/du-eligibility-criteria/amp

In Delhi University students get the admissions on the basis of Class 12 percentage or an online test for some courses.

Top 3 colleges of DU are:

1. St. Stephens

2. Hansraj College

3. Hindu College

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