Photometric observations and Numerical modeling of SDSS J162520.29+120308.7, an SU UMa in the CV period gap

•Light curves during 2010 superoutburst and 2015 quiescence are presented.•Observed Stage B P+ and Porb are 0.090604(3) d and 0.09113(0) d,respectively.•A single rebrightening is observed, an unusual event for an SU UMa system.•3D SPH simulation produce Stage AP+ = 0.09717d and Stage BP+ = 0.09702 d.•An average secondary-to-primary mass ratio q = 0.21(1) is suggested for this system.