Good books for corporate workspace?

I'm currently a college student and my soft skills in corporate need major help.

The feedback that my ex-manager gave back was that I was "off-putting." He tried to ramble and elaborate more, but honestly, I stopped listening. I think he meant I wasn't professional enough and I thoroughly believe it is my communications skills. I don't have tact. And my speech isn't corporate sounding. It's not like I add slang in every sentence, but you can definitely tell I was awkward.

Anyways, I'm hoping to find books that could help my speech be more professional. Obviously, practice talking in front of the mirror, but that's not the advice I'm looking for. I don't mind public speaking. I'm relatively ok with it. It's just I have problems with what to actually say and I would get stuck stuttering on how to make my responses better. Then my brain scramble and fries, and I'm stuttering and the words I do get out just sounds basic and word vomit-y.

Got inspiration from a thread:

"What could we improve as a team"

Bad answer: Bad leadership, poor communication, no real vision

Good answer: Develop a more collaborative leadership style, improve communication by x, clearly define and articulate the company vision

Like how do you just come up with the good answer? The way I talk, I definitely would say the bad answer since it's short and to the point. I want to get better at talking like the good answer.