The SSC GD Constable cut-off is the minimum score needed to qualify for the next stage.
It is declared separately for each state, and separately for male and female candidates across UR, OBC, SC, ST and EWS categories.
The cut-off changes every year based on vacancies, number of candidates and paper difficulty.
Scoring above the cut-off in the written exam qualifies you for the PET/PST and medical stages.
Check the official SSC website for the cut-off of the exam year you appeared in.