Can I charge a super capacitor with a MPPT?
Right now with my solar panel, the efficeny is terrible. I can get
2.85V, but the current is around 0.03 amps. Which charges my capacitor super slow.

A 100% efficient MPPT buck converter can charge the capacitor without energy loss. This means the capacitor charges to some desired voltage and acquires an energy of ½ C V². And, because the MPPT buck is 100% efficient it only required an energy from the SP of ½ C V².
Now compare it with a resistor charging the capacitor; the energy lost in the resistor are equal to ½ C V² so, to charge a capacitor this way is 50% efficient compared to using a 100% efficient MPPT buck converter. Compare it with any conversion that doesn't use an inductor as an intermediary energy storage device and the efficiency is still 50%.
A practical MPPT buck converter might have an efficiency of 90% and therefore you could argue that using this you might need 40% less energy to charge the capacitor. That also translates to it charging faster but the gains might not be worth the complexity especially if you got a bigger SP.