"To tackle the current situation" comes from the game of American football. When a runner with the ball is taken down it is called a "tackle". It is usually difficult to tackle a runner. So, the idea of tackling a situation suggests that the situation is difficult and it will take great effort to gain control of it. Your example sentence is correct both grammatically and in word usage.

yes, the sentence is correct. The expression :"to tackle a situation" is very often used in the media.

Yes it is correct. You would answer the question by saying: Yes I am quite capable of tackling this situation. I would put the following procedures into place [ list some relevant examples] Or you can say: I was faced with a similar situation in my last job. The way I tackled it [ solved it] was by holding a meeting and asking for solutions to the problem. Then I took these suggestions to management and we decided on the best course of action for our company.

The question is correct. But I don't know how to answer it.