When you sit down to practice there are lots of things that you can do that will make it more beneficial, rather than just running through your pieces.
Warm up. One of the best songs to practice for warm up is Chester Chills Out. One hand at a time, then both hands together. This is great for coordinating your fingers. Start slowly and get faster, bit by bit, without compromising the flow.
If you are working on a tricky part, just take a tiny part and work on it. Play it several times till you get it to work.
Look at your hands. See which fingers match or which notes match or are they black notes together or thumbs together etc.
Start at the end of the piece and work on the tail piece first. We tend to always start from the beginning and the end is often untidy. Once you have practiced the ending or the middle, then go back and start the piece from the beginning and play the whole piece through.
If you have multiple levels to practice, mix it up so you are not always starting at level 1. Maybe Mondays do level 3, Tuesdays level 1, Wednesday level 4 etc.
If you can't get to a piano or keyboard, listen to the songs you are learning. Listen to the timing, listen to the expression, practice on your lap, sing or hum along. All these things will help you to develop your understanding of the songs and the strategies involved in playing them well.
Most of all, enjoy yourself!