Here are some tips:
1.If you can keep a phone with you and load it with mp3s of the juz that you are learning and listen to whilst you walk.
2.Whilst walking read your memorized ayaats as much as you can throughout the day. The more you do this the more it will enforce you inside your head.
3.I understand that you may not be able to keep a quran with you at all times but what you can do is take a photo with your phone of the page and when you need to take a quick look to remember some ayaats then you can do so.
4.Read the memorized ayaats in your salaah.
5.Resolve your whole day around the quraan.
6.Try to read at least 3 juz from memory everyday. (you can do this one once youve learned more juz)
7.when youve learned something and need to find ur mistakes close the mushaf and record yourself on ur fone. Then listen to yourself whilst looking inside the mushaf and circle your mistakes.
Needless to say but ask Allah (swt) for help and guidance.