If you're hitting a hard "wall" either some concepts are not being taught effectively, or there are some undetected gaps in your previous learning that make some things difficult to understand for you. There's nothing specifically about precalc that makes it inherently harder than, e.g. Algebra II or whatever if the teaching is effective. So being able to access alternate sources of understanding, such as Khan Academy or the Math Academy OP talks about, can be especially important.
Moving through the curriculum faster is a common approach but it's also risky, because that's how the gaps are created that can then hinder your understanding later. Of course if you have reached true mastery of a given topic, moving forward is preferable to being bored to death, but assessing whether that applies can also be difficult at times.
Moving through the curriculum faster is a common approach but it's also risky, because that's how the gaps are created that can then hinder your understanding later. Of course if you have reached true mastery of a given topic, moving forward is preferable to being bored to death, but assessing whether that applies can also be difficult at times.