Last week, a trap probe was launched after the images of a math test from Edexcel were distributed online.
Yesterday, the parent company of Edexcel, Pearson said that they had decided to replace the paper which is due to be sat by around 7,000 students on Thursday because of the actions of the unnamed centre concerned being investigated.
According to the company, the probe revealed that an individual in the center had opened a package containing the additional mathematics article.
According to Pearson, there is no evidence to suggest that the test has been eliminated, but "precautionary measures" have been taken to safeguard the test for students.
The exams can be removed at the last minute for various reasons, including by mistake, opening documents and professional negligence in the center.
Last week's incident saw photographs of the questions that hid the details circulating on Twitter, although some claimed that the entire newspaper had been shared in group conversations of messages on the morning of the exam.
Sharon Hague, Senior Vice President of Pearson Schools, said: "We have contacted all our centers directly to inform them of this decision.
We will continue to support and communicate with them through this unusual but necessary step, which is vital to safeguard trust in the testing system and to ensure equity for all students.
"Our message to students is not concerned about this and will focus on their review as they normally would."
Arrangements must be made to deliver contingency documents to all centers shortly before the examination, apart from the one investigated. According to Pearson, the creation of supporting documents is "always incorporated into our processes".
Separate arrangements are being made for the center being researched to ensure that students can complete their exams.
In a video message to students, teachers and parents, Ms. Hague said that it is necessary for everyone involved in the testing system to work together.
"We trust in the collaboration and trust of all involved."
He added that the "serious breach of security" last Friday was referred to the police, as well as the investigation as a criminal matter. If the test had not been obtained correctly, it could have been stolen.
Ms. Haya has many ways to ensure fair test results, including the option to exclude filtered questions from the final calculation.
Last week's gap will be posted after similar leaks in 2017 and 2018 when the A-level math articles are published online before testing.
Last summer, police began an investigation after the leaks resulted in online auctions at the cost of hundreds of pounds the night before the date when 50,000 students were required to take the test.
The previous year, the questions in an exam were shared, which resulted in last-minute changes.
The two cases have resulted in the disqualification of 29 candidates and in the delivery of police files of 2017 to prosecutors.
Earlier this year, Pearson said he had tested a scheme where microchips were placed in test packages to track the date, time and location of packages.
When it was published the following Friday, Thursday, a Pearson spokesman responded: "The microchips were only one pilot this year, all the centers have been made, but we have implemented several security measures that allow us to quickly locate the bad practice."
By: Preeti Narula