밀림방지 - OMR 마킹 연습

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About this app

Even if you get all the answers right, you receive a score of 0 if you write one space off.

The anti-slip feature does not create problems. There are already many apps available for solving these problems.

What this app detaches and repeats is the few minutes spent transferring answers written on the test paper to the answer sheet.

This is because slippage occurs only in that specific time.

■ Grid identical to an actual answer sheet
· 45 Korean questions · 30 Math questions · 45 English questions · 20 Korean History questions · 20 Inquiry questions

· Math questions 22–30 use the exact three-digit short-answer grid format.

· For second foreign languages, mock exams, or school exams, you can directly set the number of questions and the time limit.

■ Test paper and answer sheet scroll separately

The top of the screen displays your solved answers, while the bottom displays the answer sheet.

The moment your eyes have to move up and down to reposition your answers is when slippage occurs.

If they are placed side-by-side on a single screen, your eyes do not move, making practice impossible.

■ Compare by changing the transfer method

· One question at a time — Safest but slow

· Grouping five — The method most commonly used in practice

· Solve all at once — Fastest but has the highest risk of shifting

The number of answers visible at once varies depending on the method.

■ Point out where the shifting occurred

Do not stop at simply stating, "You got this many wrong."

· Five questions from No. 23 to No. 27 were shifted down one space

· For No. 26, the answer is correct, but the digit was shifted one space to the left when filled in

Once grading is complete, the answer sheet is shown again. Both the filled-in areas and the areas that should have been filled in are visible.

■ Apply time pressure

Choose between "Leisurely," "Like a real test," or "Unhurried."

When time runs out, the answer sheets are collected on the spot. Unfilled questions remain as they are.

■ Check if it has become safer than the previous session

For each session, the time taken to transfer, the number of shifted areas, and the number of times answers were corrected are recorded. This is a record intended to check hand stability, not to collect scores.

■ No account or login required

The record remains only on this device and is deleted when the app is uninstalled.

The number of questions and test time are based on the current CSAT system (until the 2027 academic year).

This is a practice tool created by an individual with no affiliation with the Korea Institute of Curriculum and Evaluation or any Office of Education.

■ Official Source

· https://www.kice.re.kr

※ This app is an unofficial app that does not represent any government or public institution.
Practice marking with an actual OMR answer sheet and pinpoint where you missed.
Updated on
Oct 11, 2026

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
  • This app may share these data types with third parties
    App activity, App info and performance, and Device or other IDs
  • This app may collect these data types
    App activity, App info and performance, and Device or other IDs
  • Data is encrypted in transit
  • You can request that data be deleted

What’s new

실제 OMR 답안지로 마킹을 연습하고 어디서 밀렸는지 짚어준다