I would like to know which Surah are good for courage and mental strength.

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1- Recite Ayat Al-Kursi verses 255,256 & 257 of surat Baqara daily after morning prayer, and before sunset.
2- Recite this Dua after each prayer:
(سبحان من لا يعتدي على أهل مملكته!.. سبحان من لا يأخذ أهل الأرض بألوان العذاب!.. سبحان الله الرؤوف الرحيم!.. اللهم اجعل لي في قلبي نوراً وبصراً وفهماً وعلماً؛ إنك على كل شيء قدير)

I would like to know which Surah are good for courage and mental strength.

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I believe you may find your answer here in this small booklet

https://www.duas.org/pdfs/surabenefits.pdf

I would like to know which Surah are good for courage and mental strength.

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Each and every chapter of the Glorious is powerful. My humble advise is try as much as you can to recite Quran every day. Don’t allow a day to pass without going through Qur’an.

If you want to focus on one particular chapter, then I would say chapter al-Kahf

Try to recite with meaning.