If I am successful in a worldly matter and achieve high scores in tests, should I not see myself as deserving of the blessing, and not consider that a measure for me?

The servant is not entitled to anything from God; all that comes to him is by God's grace and divine enabling. So, if the shaykhs meant that the servant is not entitled to anything from God, then this is correct. However, if they intended to deny that reward and recompense are not a fixed right for those who obey, then they have erred. And upon receiving blessings or achieving excellence, it must be known that this is by God's grace and divine enabling, for He is the one who facilitates the means to success and grants the ability to perform righteous deeds.

Shaykh al-Islam Ibn Taymiyyah mentioned that the Ahl al-Sunnah (People of the Sunnah) say that the servant is not inherently entitled to anything from God. However, Allah Almighty will reward the obedient as He has promised, and He does not break His promise. And if God wills to punish someone, He punishes him only with justice, for He is far above injustice.