Provide a safe and engaging environment ¶
Reduce departmental expenses by 5% by the end of the next school year.

to wWork with classroom teachers and support them and their responsibilities for the development and education of pupils ¶
Assist in organizing classroom materials.

A teacher wanted to order scales which can shown mass and weight at the same time.

Considering the volume andits size, and that we've never used it in the past, I asked him to return the stuff and said we don't need item, saving space and money.

"stuff" and "we don't need it" sounds a bit too informal here

A teacher asked for Malonic acid to do an "Iodine clock" experiment, but we don't have Malonic acid.

I've found another method with vitamin C. ¶
What progress have you made against this Objective ?

Completeion of a professional certificate.:

Embracing continuous learning represents more than just personal growth.

I've also practiced teaching with 4 organizations.

A teacher wanted to order scales which can shown mass and weight at the same time.

Considering the volume and we'vethe fact that never used itone in the past, I asked him to return the stuff and said we don't need it, saving space and money.

A teacher asked Malonic acid (?) to do "Iodine clock" experiment, but we don't have Malonic acid.

Is Malonic acid a person? When you say "X asked Y," It implies that this "Y" is a person.

Objectives

When talking about something in general, it's better to write it in plural.

1) Provide a safe and engaging environment.¶
2) Reduce departmental expenses by 5% by the end of the next school year.

to w3) Work with classroom teachers and support them andwith their responsibilities for the development and education of pupils.¶
4) Assist in organizing classroom materials.

What progress have you made against this Otowards these objective s?

The vendor brought one and asked me to confirm whether it's suitable or not.

It's best to clarify here what the vendor wanted you to confirm.

Considering (the volume and) the fact that we've never used it in the past, I asked him to return ithe stuff and said we don't need it, saving space and money.

The volume of what?

A teacher asked for Malonic acid to do an "Iodine clock" experiment, but we doidn't have Malonic acid.

I've fou was able to find another method withhich uses vitamin C. instead.¶
¶
What progress have you made againsttowards this Oobjective ?

Which objective?

1) Complete a professional certificate. / I completed a professional certificate.

If you are using these for an interview. You might want to list them out numerically or make proper sentences.