I had had four tests! Is it right

[DreamyPink307]

Hi

Is it right to write:

In the past last two weeks, I had had four tests.
or
In the past last two weeks, I had four tests.

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Is it right to write :

I received your letters three days ago and I have tried to reply ever since.

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Is it right to say :

Teacher,will we be having class today?


Thanks a lot fot your help.

[Mister Micawber]

.
These are right:

In the last two weeks, I had four tests.
In the last two weeks, I have had four tests.
I received your letters three days ago and I have tried to reply ever since.
.

[DreamyPink307]

Thanks a lot for your fast replay.
I added this a few seconds ago. Is it wrong?
Teacher,will we be having class today?

[Tdol]

No, it's perfectly correct. In the UK, we don't call teachers 'teacher', but the rest sounds natural to me.