Whether you can pass the exam at one time depends on how much time and energy you put into studying, thinking and summarizing systematically, practically and effectively.
Now that you have decided to start preparing for the civil service exam, don't always think about whether you can take it once. Is it useless for me to study like this and whether I can study casually?
"I just want to go ashore once!"
"How to go ashore once?"
When you think about it, go ahead and execute it.
As for Mr. Huamujun and Mr. Antelope, I suggest you go to official website to learn more. Personally, I think it's good because my wife is following them.
Personal suggestions for your reference!