My 2020 new years resolutions

I made many new year's resolutions every year, but most of whichthem ended up in failure.

I'm going to pass EIKEN's Grade 1 in 2020.

EIKEN is a well-known test in Japan to[that] assess[es] English proficiency, which[and it] consists of two stages.

The first stage is a written exam including[that] includ[es] reading, listening, and writing.¶
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OR¶
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The first stage is a written exam [that includes] reading, listening, and writing parts.

"parts" is optional

It is the first barrier for me to pass an[the] exam.

use "the" instead of an in this case because you are talking about the specific test (eiken) while using "as" means that you are taking any test

The second stage is a speaking test, which will[is to be] conducted in a face-to-face interview manner with two examiners.

There are five months left until the first stage [of the] test.

My 2020 nNew yYears rResolutions

I made many nNew yYear's resolutions every yearin the past, most of which ended up in failure.

I' am going to pass EIKEN Grade 1 in 2020.

Avoid contractions in your test (I'm, don't, won't, can't etc). They are good when talking to friends, but in the test it would be better to not use them.

EIKEN is a well-known test in Japan tohat assesses English proficiency, whichand it consists of two stages.

The first stage is a written exam includwhich contaings reading, listening, and writing partsections.

In the writing section, you have to write an essay with aboutof 240 words on a given topic.

It is the first barrier for me to pass anon the exam.

The second stage is a speaking test, which will be conducted in a face-to-face interview manner with two examiners.

It' is the second barrier for me to get through the exam.

There are five months left until the first stage of the test.

My 2020 nNew yYear's resolutions

I've always made many nNew yYear's resolutions everyach year, most of which have ended up in failure.

This sentence is tricky to capture the nuance I think you want! I'll try to explain why, but I don't know if it will really make sense, ahaha.^^;;

"I made" makes it sound like you're talking about one year in particular. So, (for example), like "I made many New Year's resolutions last year." However, this isn't right, because you are talking about many different years.

So, you could say "I've made many New Year's resolutions every year," but I think that makes it sound like you're talking about this coming year as well. That's not right since you're doing it differently this year.

I'm not 100% sure whyd the correction I made sounds more natural to me, but I think it fixes those problems.

EIKEN is a well-known test in Japan tohat assesses English proficiency, whichand consists of two stages.

The first stage is a written exam including sections for reading, listening, and writing parts.

In the writing section, you have to write an essay withof about 240 words on a given topic.

IThat is the first barrier for me to pass anthe exam.

The second stage is a speaking test, which will be conducted in a face-to-face interview manner with two examiners.

IThat's the second barrier for me to get through the exam.

You can also use "obstacle" instead of barrier. Your choice, of course!

I madke many nNew yYear's resolutions every year, most of which ended up in failure.

EIKEN is a well-known test in Japan tofor assessing English proficiency, which consists of two stages.

My 2020 nNew yYear's rResolutions

I made many nn the past, I made several New yYear's resolutions every year, most of which ended up in failure.

EIKEN is a well-known test in Japan towhich assesses English proficiency, which consists of two stages.

The first stage is a written exam which includinges reading, listening, and writing partsections.

The second stage is a speaking test, which will beis conducted in a face-to-face interview manner with two examiners.

My 2020 nNew yYears rResolutions

I made many new year's resolutions every year, most of which ended up in failure.

EIKEN is a well-known test in Japan tohat assess English proficiency, which consists of two stages.

The first stage is a written exam that includinges reading, listening, and writing partsections.

It is the first barrier for me to pass anthe exam.

it's specific so you should say the

The second stage is a speaking test, which will be conducted in a face-to-face interview manner with two examineproctors.

There are five months left until the first stage test.

Since we know the first stage is the first part of the exam, having test is not necessary in my opinion