Its Board of Management Chairman, Chong Yun Choi said one of the steps taken by the school is by reducing the intake of pupils.
"We currently have 1, 500 pupils and we will slowly reduce the number of classes," he said, adding that there are 12 classes in the school at the moment and that a single session will improve the quality of teaching and curriculum activities.
"At the moment, we have about 40 pupils per class for Primary One to Three in the afternoon session and 44-45 pupils per class for Primary Four to Six in the morning session," he added.
"It is the vision of the school to have a one session class but we are not sure when we will officially run it because this means we have to change the whole structure of the school.
"We need a three to four storey building and this would involve a huge some of money because this is a massive plan," explained the school chaplain, Rev. Chin Pit Vun.
Earlier, Chong said that the new building behind the car park will house its counselling room, sports facilities store and for the filing of all school records.
"We are also renovating a room especially for teachers to rest and relax.
It is not really a big project, however, I would like to thank the State government for giving us allocations of around RM50, 000 for the maintenance of the building and the Education Ministry for their assistance by providing allocations to all mission schools," he said.
He also said that the school had also held bazaars in order to raise funds.
He said this during the school's 100 Years Centenary Celebration here, Tuesday.
Chong said that the year 2014 is a very special year as it is in its 100th year celebration and it acts as a kick off for all upcoming celebrations throughout the year.
"We will be having a lot of activities and some of them are mini concerts and bazaars organised by the Parents and Teachers Association," he said.
He also said that there will be a grand dinner on Oct 31.
"We are inviting all ex-pupils, former teachers and headmasters and headmistresses to attend the dinner.
There will be tickets sold and at the end of this year, we will hold a Thanksgiving Service at Christ Church, Likas led by the rector itself, Rev. Chin," he said.
"The school will also have various activities, for example, the pupils will be able to participate in song and poetry writing competition, essay competition and drawing competition throughout the year in order to give them opportunity to be involved in the celebration," he added.
Later, Chong explained that SK St. Agnes had started off as a girls' school after the British decided to introduce mission schools in Northern Borneo and had been maintained by the Archdiocese of Sabah ever since.