Is B.Sc a suitable course to prepare for civil services? If not, which is the best course for the same?

Dear, Minimum eligibility criteria for civil services is graduation from any UGC recognised university. So, after B.Sc, you are very much eligible to appear for civil service exam. Suitability depends on one's interest and skills for in-depth study towards the subject taken in under graduation level

Of course, B.Sc in a suitable course to prepare for civil services. You just need a graduation degree. Good luck.