Tired ByAfter Taking a Test

It is am very tired after taking an English speaking test.

You could also say:

It was very tiring to take an English speaking test.

Unlikely other tests, Ithis one feelt more hard todaydifficult.

In my opinion, it is caused by heavy pressure, which I have to get a higher score.

I always try not to think about it, but I finally do like thatin the end I always do.

Tired Byfrom Taking a Test

"Tired from" is a set phrase in English. E.g. "I am tired from running/working all day/staying up all night looking after the children, etc."

It is very tired after taking an English speaking test.

"I am very tired" in this specific situation, or "It is very tiring" to talk about something in general. E.g. "It is very tiring waking up every day at 5am."

Unlikely other tests, I feel more hardthis one was more difficult today.

Make sure to repeat the subject: "this one/it (the test) was more difficult". You could also say "harder" - these mean the same thing.

In my opinion, it iwas caused by theavy great pressure, which I have to get a higher score.

I always try not to think about it, but I finally do like thatin the end I can't help myself.

Your sentence was a bit difficult to understand. Do you mean "I always try not to think about it, but I still think about it"? Let me know.