For a science course, you should choose Kirori Mal College. For science, it is the best college. The teachers are dedicated and they give their due attention to academics. They offer good class notes. Most of the faculty members are cooperative and student-friendly. The infrastructure of the college is good. The labs are well equipped. Practical classes are conducted regularly. 

Your preference order should be Kirori Mal>Ramjas>IP>Daulat Ram. 

• KMC and Ramjas are both situated at the heart of the north campus. Both of these institutes are also equivalent in terms of the academics and faculty base for Economics Hons. KMC has a slight edge over Ramjas in terms of a better student crowd. 
• IP College for girls is also a good option for girls with strict and good faculties. 
• Although Daulat Ram is also situated at the North campus, the faculty base is not that good as compared to the other three colleges. 

One of my friends studied at Ramjas College, so my answer might be a bit inclined towards it. But SVC is also a good institution, so the choice basically depends on that particular individual.

• Ramjas is located in the North campus while SVC is in the South campus.
• Ramjas is known to have the best faculty for Botany at Delhi University. They have a dedicated greenhouse for botany students in Ramjas.
• Both SVC and Ramjas have really good lab facilities. 
• ECA participation is almost the same in both colleges. 
• Ramjas has its own Model United Nations society, which SVC does not. 
• Also, Enactus Ramjas, which has been second in the nationals for 2 consecutive years, is far better than its SVC counterpart.

So, it all comes down to the fact where you want to live, grow and explore. Choose the one that suits your requirements the best.