There are a lot of things being discussed here, and I think the OP may need to reflect on themselves too.
Speed, 28 hours isn't so bad, I took a lot longer. You need as long as you need. It is up to your ability to take it all in and demonstrate your ability, not about the school wanting money just because you are over 20 hours. That is a minimum and generally it's youngsters who do it for that.
You could not do the later syllabus up front as you didn't know how to control the aircraft then. No point in teaching you about a precautionary landing if you don't even know how to land. The syllabus builds up in layers of knowledge and ability.
Regarding the brake fluid, I think that you need to discuss with your next school if they will teach you about the whole aircraft and how it works, or you need to figure it out yourself. You have brakes, you should therefore know that brake fluid is involved, so of course you should check it. Now if you are like me and need to learn about mechanical things from scratch, then you need to question the school on why they didn't detect you don't know these things and teach them to you. But if you don't know something, find it out.
At the end of the day do what you think is right. Don't ask others. You are the PIC of the plane and your life, so if you don't like that school then move. If the plane feels wrong them don't take off.