Please give my some advice
The topic of this essay is to writing a proposal to my principal and suggest three ways to recycle, reuse and reduce the use of paper.

Proposal
By
Chris Wong
On
Saving Paper
Introduction
The rapid development of both economy and industry fields sparks off a great demand of paper. Paper is made from tree and tree is essential to reducing the content of carbon dioxide by carrying out photosynthesis. However, thanks for the reduction of tree, carbon dioxide and other toxin gases are in high content. So, being the next generation of the world, we have the obligation of protecting the environment and it is high time our school took the initiative to indoctrinate the students with the importance and methods to save the paper.
Following is some suggestions about this issue.
1. Seed cultivation
It is a competition held among the classes. The classes could have to grow a plant out of the seed given, but no chemical fertilizer could be used. The best plant would win the competition.
The competition will be held right behind the examination lest the students might be distracted from study. We would invite our respectable principle to be our judge.
As everyone knows, paper is from tree. Through this activity, students could understand the difficulties of the plant grow. Therefore, they would cherish the paper.
2. Replacement of paper textbook
With the breakthrough of information technology, the world is being revolutionized. Now, using the computer is being the tendency. So, the school should also cater for this tendency. Using computer for teaching and learning is the first step. It could reduce a great amount of paper. For example, some lesson is not extremely vital to have a book such as music, art and so on. School might project the teaching materials on the screen with the aid of technology instead of a paper textbook. It is the work that school can be done for saving paper.
3. Placement of more recycling bin
In fact, each student understands the importance of this issue and most of them are willing to it if there is no trouble. However, in our school, we only have one recycling bin for paper on the ground floor. So, it is a torture or nuisance to students for carrying the book from up floor to ground floor.
It is better to place one or more recycling bin on each floor. So, students can be easy to disposal the used paper in the recycling bin
Conclusion
Admittedly, what we have done might be very negligible to this field, but we at least will not exacerbate the precise environment in large extent, besides, we can spread out this idea to other. By that time, global attention on this environment issue can be aroused. At that time, not only can paper be saved, but also other natural resource. On the contrary, if we still consult the natural resource without consequence. Our earth will definitely have a lamentable future and finally be ended.
Finally, hoping you can find the aforementioned suggestion feasible and held the activities without procrastination.
Is this an essay for HKCEE or HKALE?

Just curious.
it is for HKCE,
are you the student from Hong Kong too?
If yes, would you mind give me a grade to this essay.
Teachers: We supply a list of EFL job vacancies
I'm no marker, sorry.

You make the mistake most CE candidates make: making your sentences and wording more complicated than necessary. Markers reward simple and correct English, if memory serves.

he rapid development of both economy and industry fields sparks
off a great demand of paper. Paper is made from tree and tree is
essential to reducing the content of carbon dioxide by carrying
out photosynthesis. However, thanks to the
reduction of tree, we now detect a high concentration of carbon
dioxide and other toxin gases in the air. So,
being the younger generation (awkward),
we have the obligation to protect the
environment and it is high time our school took the initiative to
indoctrinate the students with the importance of
conservation
and methods to save the paper.

Here are some suggestions about this issue.
1. Seed cultivation
(you need to introduce the idea first. e.g. We can hold a
competition...)
It is a competition held among the
classes. The classes could (wrong modal verb)
have to grow a plant out of the seed (only 1??)
given, but no chemical fertilizer could be used. The best plant (best
plant? how do you define it?)
would win the competition.

The competition will be held right behind (after,
not behind) the examination lest the students might be distracted
from study. We would invite our respectable principle to be our
judge.

As everyone knows, paper is made from tree.
Through this activity, students could understand how plant
grow. Therefore, they (who are they? be clear) would
cherish the paper.
2. Replacement of paper textbook
With the breakthrough in information technology,
the world is being revolutionized. Now, using the computer is the
trend
. So, the school should also cater for this
tendency. Using computer for teaching and learning is the first
step. It could reduce a great amount of paper. For example, some
lessons do not require a book, such as music,
art and so on. School might project the teaching materials on the
screen with the aid of technology instead of using a
paper textbook. It is the work that school can be (not
passive)
done for saving paper.
3. Placement of more recycling bin
In fact, each student understands the importance of this issue
and most of them are willing to (verb?) it if
there is no trouble. However, in our school, we only have one
recycling bin for paper on the ground floor. So, it is a torture
or nuisance to students to carry the book from
upper floors to the ground
floor.
It is better to place one (words deleted)
recycling bin on each floor. So, students can put the
used paper in the recycling bin
Conclusion
Admittedly, what we have done (you haven't done it yet) might
be very negligible in the overall scheme of things,
but we at least will not exacerbate the precise (wrong
word) environment any more than we have to,(you
need a period here)
besides, we can spread (word
deleted) this idea to others (be specific). By
that time (what time? usually we say: by the time
something happens)
, global attention on this environment
issue can be aroused. At that time, not only can paper (put
"but also here")
be saved, but also other
natural resource. On the contrary, if we still exploit the
natural resource without caring about the consequence,
Our (no need to capitalize) earth will
definitely have a lamentable future (words deleted).

Finally, hoping you can find the aforementioned suggestion
feasible and held (why past tense?) the
activities without procrastination.
I want to know more 'making your sentences and wording more complicated than necessary' .
My teacher say that to me too, but I am confused.
what do you meaning by necessary?
I only know that format letter need a more complex sentence that that of informat letter
To score well in CE, the #1 thing is to use sentences structures and wording you can handle.

e.g. Admittedly, what we have done might be very negligible to this field, but we at least will not exacerbate the precise environment in large extent, besides, we can spread out this idea to other.

I understand what you say here, but the sentence just isn't right.

How about something simpler:

I know our efforts may not help us save a lot of paper, but at least we are doing something to improve the situation. Besides, we can set an example to the rest of the student community.

In my humble opinion, if we express ourselves to the best of our abilities, we'll do very well. Again, my 2 cents.

I took CE back in the 80s. Just to tell you how OLD I am!
Students: Are you brave enough to let our tutors analyse your pronunciation?
How can I improve this problems??
Please advise
My 2 cents: review your basic grammar and use more simple sentences.

Don't listen to those who tell you that using X or Y (e.g. inversion) will impress your marker.

I did just fine in CE writing with very simple English.