Is it true that a student of worldly knowledge who seeks Allah's countenance through his learning will attain the reward of a complete Hajj if he goes to school, by analogy with the Hadith that mentions the reward of a complete Hajj for whoever goes to the mosque in the morning to learn? And can other merits of seeking knowledge be mentioned to increase enthusiasm and persistence?

Learning beneficial worldly sciences is a collective obligation (fard kifayah). If some individuals undertake it, the sin is lifted from the rest. It may even be better than an individual obligation (fard ayn) due to its widespread benefit. Learning these sciences may become an individual obligation for some students if the Muslim community is in need of them and there is no one else to fill this void. Therefore, continue on your path and do not be swayed by the whispers of Satan. Purify your intention for Allah to achieve happiness in both worlds. As for the reward mentioned in the referenced Hadith, there is no specific text regarding it, and it is not permissible to delve into it with personal opinion.