Is a student's declining academic performance and indolence in studying, despite his love for his field of study, a sign of God's wrath, and how can this feeling of aversion to studying be overcome, and what are the appropriate supplications to improve the situation?

What you are experiencing is not necessarily a sign of God's wrath. You should strive to obey God, perform the obligatory duties, and increase in supererogatory acts. Abandon laziness and diligently pursue your studies, seeking help from God and frequently supplicating. Be mindful of honoring your parents and benefiting the Ummah through your studies. Pray for your situation to improve and seek refuge from incapacity and laziness. There is no specific supplication for your situation, but frequently recite the comprehensive supplications of the Prophet (peace be upon him) that encompass the good of this world and the Hereafter. Make sure to organize your time and be strict in utilizing it.