u/Embarrassed_Ad7641

I live in an extremely hot and humid place and my sunscreen keeps running off or piling due to excess sweat and it looks extremely awkward when I am in college. I currently use Neutrogena and I have a hard time trusting other brands due to lack of valid spf certification. But I cannot continue using my current one because I still tan and find it difficult to reapply. Would any of you lovely ladies recommend me anything suitable? Please consider that I am a student, so something ideally around 600 -700 rupees