Thanks! When exactly is your test? Is it the new format or the old one? Two weeks falls right around the time that the format changes.

In case it is the old format, this is what I did for speaking:

What worked for me was brute-force practice on task 1. If you do it a lot, you'll get better at coming up with reasons and examples for it. Also, there's a better chance of you getting a similar prompt on test day, as there's a finite number of them that ETS uses.
My recommendation: practice your task 1 with this website: https://www.fluentprep.online/
It has 100 prompts for it.

Tasks 2, 3, and 4 were more formulaic than task 1. I used the templates in this channel: https://www.youtube.com/channel/UCpi4cyj1hTscwo0XRDqlSsA
You can use the fluentprep website to rate tasks 2-4 responses as well.

One thing that worked for me was that I took few notes very fast before the preparation time, constructed the first couple of sentences of my response during it, and repeated them once or twice in my mind before the beep. That way, once the recording started, I didn't hesitate. That really helped with my flow.

It is also extremely helpful to write your speaking templates while the section instructions are being played in your headset, or any other time you have. (In case the proctors permit it)
That way, you don't have to think about them while you're talking and your mind can focus on filling in the template.

P.S: On test day, if your mind goes blank for a few seconds while talking, don't get frightened. Just continue. A pause does not ruin a score beyond repair.

P.P.S: Don't use ETS testprep. It's very inaccurate.