I study IBDP 1 , and I need math problems which are hard to solve. This is for two reasons:
They really help in preparing for examinations.
Solving difficult problems really fills my heart with joy and satisfaction :)
Sometimes, I do find great questions on this awesome website. But, I usually run into questions which are above my knowledge level. So, if any of you could provide links to challenging math resources, I will be very thankful.