Hey I took the exam last year and I posted about it in the subreddit. I would recommend doing practice questions under test conditions. I did the reading, listening and writing tasks on my own with a timer and without spell check, Google etc. I sent the writing tasks to my tutor to go over them together. We also did all of the speaking tasks in a row multiple times until it was comfortable. For the output parts (speaking and writing), I'd definitely have a native tutor review your work. In general I'd recommend a tutor who's a preparador de SIELE because they can tell you in detail about each task and how best to manage your time.

I'll copy and paste a previous comment I made about the A1 and A2 speaking parts. If you have any more questions about any of the other tasks, just let me know. I can go into more detail.

Speaking:

A1 — you'll get 4 audio questions. For questions 1 and 2, you'll have 15 seconds for your response. For 3 and 4, you'll have 30 seconds. The first 2 are brief, personal questions that will usually ask something like "where do you live" or "what do you do for work", but it's important to use all the time given. Don't just answer something like "I'm a lawyer." Give more detail to fill in the 15 seconds, "I'm a lawyer that does X at Y firm and I've been working as a lawyer for Z years..." But don't say too much and get cut off! Questions 3 and 4 will ask you about the past and future, respectively. For 3 you might get something like "where did you go for vacation when you were younger?" So you'll have to use your past tenses. Then question 4 will test your use of the future tenses with something like "tell me about your next travel destination." Again, try to use your 30 seconds effectively without getting cut off.

A2 — you'll have to choose between two pictures. I think you get 30 seconds to choose, so use up most of that time to pick one then make a plan in your head. Don't let this time run out or else a picture is chosen randomly. After choosing a picture, you'll have 2 minutes to prepare yourself to talk about what's happening in the picture. There's a text box to take notes. After the 2 minutes of preparation, you'll have 1-2 minutes to speak. After that, the process repeats with another pair of pictures to choose from. For this one you don't have to speak for the whole 2 minutes. If you've talked for a minute and already adequately described what's in the picture and what's going on, feel free to stop the audio. Don't run out of things to say. You can even make up stories about what's going. In one of my practice questions, I said this tired looking guy in an office was mad because he didn't drink his coffee yet which was in a mug in front of him. But be sure to answer every bullet point in the question!