The past tense of scare out of one's wits is scared out of one's wits.
The third-person singular simple present indicative form of scare out of one's wits is scares out of one's wits.
The present participle of scare out of one's wits is scaring out of one's wits.
The past participle of scare out of one's wits is scared out of one's wits.