You cannot adjust AI skill level, no.
If nothing works, you can load the mission in question in the editor and edit the trigger necessary to complete the mission.
For example, if in any mission one critical goal is named "12345", then the trigger will exactly bear this name in the mission. click on it, and un-hook "critical" on the first page of the trigger. now you can exit the mission and it will resolve as completed.
Be mindful about this, though.
RA is more difficult, yes, but it isn't as much as you make it out, so don't ruin your own fun and learning process by just skipping everything.
One further note: Sorry to say, but the RA campaigns are quite badly designed/playtested in general and often cause confusion and problems due to bad mission design - not the mod or game itself.
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