"We will re-check all relevant information and announce the scores again on April 11," NIETS director Prateep Chankong said, after more than 300 students and parents showed up at his office to complain about many flaws in the score-announcement system.

The Higher Education Commission's secretary-general Pavich Thongroj, also postponed the application deadline for students to enrol at their favourite universities from April 10 to April 18. Applications can also be submitted during Songkran holidays.

This year is the first time the O-Net (Ordinary National Educational Test) and A-Net (Advanced National Educational Test) scores have been used as admission criteria to enrol at higher-educational institutes.

However, the O-Net and A-Net system seems to contain many flaws.

On April 1, thousands of students were frustrated to find that the score announcement was postponed from morning to evening. However, by evening most students were still unable to view their scores because the NIETS web site apparently could not cope with the huge amount of attempts to access it. Some students spent a restless night trying to access the web page until early Sunday.

When students did manage to access the site they were shocked to discover they got zeros in some subjects despite the fact that they should have at least earned some scores.

After exchanging their views on many chat lines hundreds of students officially called on NIETS to fix the problem.

"It's impossible I got zero on O-Net math because I earned a 67 score in the A-Net math that is more difficult," Chayanit Leelawattanakul, a student at St Joseph Convent School, said.

Prateep insisted the test scoring was accurate, but the "zero" came up because many students gave incomplete information about themselves.

"They have entered wrong identification card numbers," he said. However, all information can be re-checked because all test papers were scanned and kept in the system.

The website also had a section for students to lodge their complaints.