Supriya, although it is tough to finish all the important topics in a month but if you would have studied these topics before, then revising them in a month is quite possible and good preparation of these topics may fetch you a decent enough percentile in JEE MAINS:-

CALCULUS

CONIC SECTION

APPLICATION OF DERIVATIVE

INVERSE TRIGONOMETRY

TRIGONOMETRY

COORDINATE GEOMETRY

BINOMIAL THEOREM

VECTORS

STRAIGHT LINE

FUNCTIONS

MATRICES AND DETERMINANTS

LIMITS AND CONTINUITY

Hi Supriya,

You should be thorough with the concepts of limits and continuation, trignometry, integeration, definite integeration, differentiation as most of the question from these topics. Also refer previous year paper for better insights.