Learn English – Off the list or out of the list

Usage

In general, you "put something on a list" and "take something off a list". In addition, lists are generally "of" something (when describing what's on the list) or "for" something (when describing the purpose of the list). In this case, the preposition "for" is more appropriate. As a result, I would express your sentence in the following way:

I am very sorry. I am no longer interested in joining. Could you please take me off your list for the upcoming interview?

(Also note the use of periods to separate entire sentences, rather than commas.)

Declining Interviews

This note is probably too direct in what ought to be a somewhat delicate situation. Turning down an interview after it's been offered can potentially burn bridges.

I'd suggest saying the same thing without saying, "I am no longer interested in joining." It could imply you've changed your mind about the company and never want to be work there, even in the future.

I'd word your note in the following way (or something similar):

Thank you very much for considering me for this position. However, I would like to withdraw my application at this time. I sincerely appreciate your time and attention.

1) Never in my wildest dreams did I think I could actually pass the exam.

2) Spoken language: Never in my wildest dreams did I think "I can actually pass the exam". [quoting oneself]

And the "I can actually pass the exam" would be given air quotes in speech or a change of tone when speaking it to show it is quoted within an utterance.

3) Never in my wildest dreams do I think I can actually pass the exam.

That is how I would write them. Unless you part about passing the exam is quoted within the utterance, it has to be either in the past or in the present: can//do and could//did.

My answer is the same as the other except with regard to handling the quoted part.