Hello,
The BS-MS course of IISERs provide standard education when compared to the traditional B.Sc and M.Sc degrees. Also this similar to Integrated M.Sc where you can complete BS and MS continously without applying once again.
The course usually teach foundation courses in physics, mathematics, biology, chemistry for first 3 years and Major (one from Biology, Chemistry, Physics, Mathematics) for the last 2 years. In B.Sc. say Zoology you dont come across such foundation courses, you readily get into subject in the first semster itself or into a bridge but that only spans for one or two semesters.
If you are looking for research especially inter-disciplinary one, you can opt BS-MS. You can enter in this course through KVPY, JEE or Exam for students qualified the Board Examination of Class 12.
For more details of course you can visit https://www.iiseradmission.in/
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