If someone told me not to think about anything and just focus on my studies, I would acknowledge their advice but also share some perspective.
I might respond by saying:
"Thank you for your advice. Focusing on studies is indeed important for academic success. However, it's essential to strike a balance between studying and taking care of our mental well-being. Taking short breaks, engaging in activities we enjoy, and managing stress can actually enhance our ability to concentrate and retain information. Mindfulness and relaxation techniques can help us approach studies with a clearer and more focused mind. So, while I understand the importance of studying, it's also essential to consider our overall well-being to achieve optimal results."