This is not marks.This is percentile score.You obtained 68.4959387 which represent that 68.4959387% candidate in your session score equal to or less than your raw score.This percentile is common to all not any category specific.You can take rough idea about rank in general category using this formula:Probable Rank = (100- NTA percentile score) X 874469 /100 .This is probable rank.

For exact rank in category ,wait till NTA declares raw score and cuttoff for each category which will released after 2nd phase of jee mains exam.

GOOD LUCK!