Hello Vaibhav

67.49 percentile is NOT a good score to get some better college, therefore, You should Try to do better in the Next attempt of Jee main which will be held in the Month of April, The Registration for Same will begin from February 8th Onwards.  67.49 It means 67.49% student of the Total student appeared for the Exam are Behind You Therefore 32.51% students of the Total students appeared for the exam are Ahead of You, Therefore Your calculated Approximate rank is 28429 But Note that this rank is Not the Final rank Your  Rank will change Because It depends on Performance of You and Others in the JEE Main April, And the final Rank would be calculated Based on comparing Final percentile ( Whichever is Higher in Both the attempts if any) of all the students

Hope This Helps All the best.