Hey,

To be very honest Bsc percentage in research oriented fields are only used for satisfying a minimum marks weightage required by any organization. Clearing CSIR NET will definitely help you a lot in you career.

Although the importance of graduation percentage may vary depending on the organization you are approaching. But a decent rank in CSIR NET will definitely help you in overshadowing your low graduation percentage as far as you have score above the minimum required.

Hope that helps.

Thank you.