I remember I was "coerced" by my school to use IXL to practice mathematics... IXL has a wide range of 'skills' to learn, including geometry, according to your grade. It's quite fun and I'd say it's quite helpful! My school set up a fund for the usage of IXL so we had a specific membership that granted us unlimited practice questions, but guests get up to 20 practice questions everyday for free (if you're not willing to pay, of course!)
If that doesn't work for you, then looking up exactly what you need or even asking these things here on Blurtit, as HappyToBeHereToo said, is always a good option.