75% (65%) minimum marks requirement is only for admission to IITs, NITs, IIITs, CFTIs. If there is a college which does not fall under any of those, and is accepting admission through JEE Main 2018 ranks even for students whose marks are less than 75% (65%), then perhaps yes. The official information brochure says “The above mentioned policy could also be adopted by other Technical Institutions participating in counselling through JoSAA/CSAB.
For subjects combination- Though basics subjects are Physics, Chemistry and Mathematics but the detailed combination of subjects is as below:
For BE / B.Tech Courses
Any one of Chemistry, Biology, Biotechnology, Technical vocational subject
Any other subject
For complete eligibility check here- https://admission.aglasem.com/jee-main-eligibility/