If

If I had even known where he was, I wouldn't have told you.

If I even knew where he is, I wouldn't tell you.

Is that possible?

If even I knew where he was I wouldn't tell you

The more idiomatic version is "(even) if I knew where he was, I wouldn't tell you!"

'was' represents 'past' or present here?

You are actually talking about where he is now, but for some reason in this type of situation the past tense was is often used. I don't know why. Perhaps someone with more insight can weigh in on the matter.

Ok.
If I had known where he was.

Same here but its past but same 'was'is being used here

Situation is I am standing in a forest.
If I knew it was a jungle i wouldn't come here.

Or

If I had known it was a jungle I wouldn't have come here.

Or.

If I had known it was a jungle I would not come here.

Are there correct for this situation

rashid rajalIf I had known it was a jungle I wouldn't have come here.

This is the most normal and natural. If you said the others, your listener would assume you meant this one but had misspoken.

CJ

I am still in jungle so can't i say ' I wouldn't have come here' because its for past that has happened sometime ago.
But as I am still in jungle should I say ' I wouldn't come here'
Is that right?

rashid rajal I am still in jungle so can't i say ' I wouldn't have come here' because its for past that has happened sometime ago. But as I am still in jungle should I say ' I wouldn't come here'Is that right?

No. I think you are misunderstanding something. If you are in the jungle, you must have already come to the jungle previously, so your coming to the j