Try to learn 3 ayat every day, so you remember it better.
Set a deadline for yourself. So prick a date on which you have to know the surah completely by heart
Allow yourself to hear the surah from a neighbor who already knows the surah. You then discover which mistakes you make.
Do not learn for too long. If you learn too long, you will not remember it anymore. It is best to spend a maximum of 30 minutes on the 3 ayat. Try to learn Quran online with help of online tutors.
Recite the surah calmly and accurately. This gives you more rest and thus reciting is also easier. The pronunciation of the ayat will be clearer and also more pleasant for the listener.