We present new photometric follow-up observations of transiting exoplanets HAT-P-25 b and WASP-11b / HAT-P-10b obtained at TUBI. TAK National Observatory, Turkey. The new transit light curves of both systems were analyzed using WinFitter code. Planetary radii of HAT-P25b and WASP-11b/HAT-P-10b were found to be 1.18 +/- 0.11RJ and 1.02 +/- 0.09RJ, respectively. Transit ephemerides were updated and transit timing variation (TTV) analyses were performed using all mid-transit times published in the literature together with ours.