Important Tips for good results in DNB CET using equating and item response scaling

DNB CET Scoring & Results: 3 Tips and insight for DNB July 2015 Exam

300-MCQ, multiple question papers are used for different sessions and days between 1st and 4th July 2015. A process of linking, equating and scaling is used to score for the final results. 

Linking: When DNB CET tests are purposefully built to be different (e.g. 8 different exam papers in 4 days), there will me major differences in their difficulty levels and content. A linking process is conducted to establish a relationship between the different test scores. When DNB-CET tests contain very different content, linking will not be adequate for all purposes of scoring. 

Equating: Equating various DNB CET exams is a way of specific linking. It is a process used to make different DNB CET tests conducted over 4 days interchangeable. Equating adjusts the difficulty levels of each exams. After equating score forms can be used interchangeably. 

Scaling: Scaling is  process of changing the raw scores into a different scale. If a candidate receives a raw score of 205 in DNB CET, it is impossible to know how well he or she did without knowing the total number of points of other candidates. Item Response Theory (IRT) is used to scale the results. Rather than relating scores on two DNB exams, scaling transforms scores on one test to a different metric that is more easily interpreted and understood. At  this stage there is only only 1 score for everyone. 

Why is IRT used for DNB CET?

GateToMedicine interviewed experts on exam results measurements to simplify the process for the better understanding of candidates.  The IRT models shows a probabilistic relationship between the candidates response on a test and some latent trait such as reading ability or some personality trait e.g. guessing. 

What do you need to know? 

There are 4 parameters in the IRT scaling process that is important to know. Parameters a, b, q and c. 

Item Difficulty (parameter b): This this the point where the candidate has a probability of getting the answer correct. Candidate’s ability parameter ‘q’ correlates to this. A candidate with the same ability as the question difficulty will have a 50% chance of getting it correct. People with higher ability will have a higher chance. Hence a b parameter of ‘0’ means average difficulty. Scores of ‘b’ parameter ranges between -3 to +3. Here ability and difficulty levels are assessed. This process is similar to the one used on G2M genius. 

Item discrimination (parameter a): In simple terms this determines how much the question or item contributes to a student’s ability level. E.g. a new question added for the exam can be rated 3 and a frequently repeated question could be rated 1. This means that higher the item is rated, candidates ability is scored higher. Hence a continuous supply of new questions from important topics is important in high scores.

Pseudo-guessing parameter (parameter c):  To is to check the probability of a person with a very low ability getting a correct response to the MCQ. This identifies whether guessing was involved in the response. And questions or items with his ‘c’ score are rated low in ability assessment. 

3 Important Tips for good DNB CET results using equating and item response scaling

Tip 1: Master the ‘Difficult Questions’: 

difficultThe new method of assessment means that it is important to master the ‘difficult questions’. Let me clarify what is a difficult question. It is not a question that you have not revised yet. A difficult MCQ for DNB CET is a question that 70% of the people make mistake. If you get this right you have a scoring advantage!

Practical Tip: One easy way of finding questions that most people mistake is by using the difficulty filter or G2M Study panel. Use your platinum access and screen for difficult question from AIPGMEE and DNB packs. See the screen below:

Difficult questions are assessed by the G2M server from questions that 65% candidates got wrong. This percent will be revised before AIPGMEE. Make sure you revise all ‘difficult level’ questions before DNB. You may not be able to do this with books or course materials.

Tip 2: High Yielding New Topics

The MCQs which are about the ‘latest’ and the new advances in clinical practice, which are recently contributed often gets scored highly in DNB CET. This is often from the high yield and advancing topics. High-Cognitive MCQs score more than others. You may also read the article on High Cognitive MCQs (Clinical Vignettes).

Practical Tips: You may follow the 101 High Yield Topics on Platinum Access prior to AIPGMEE. See the HYT Calendar Below. 

H-Y-T Calendar & INTEREST Submit

Also revise the High Cognitive MCQs (Clinical Vignettes) Read More Here.

Tip 3: Practice to Avoid Surprise in DNB CET Results

G2M Genius is a good platform to revise with Item Response Theory Application. Your progress to a clever level after attempting 100s of questions will indicate thorough preparation for IRT. This is because your answers and ability are constantly assessed against others as in the real DNB and AIPGMEE exam. Use your Platinum Access to attend G2M Genius (each packs separately for revision).

DNB CET Scoring & Results

Knowing the scoring system is key for improving your DNB CET July 2015 and AIPGMEE 2016 results

Attend Tamil Nadu, DUPGMET, DNB Intensive 06 & KPGMEE on CENTER 1 or on Apps.

AIPGMEE STUDENTS MOCK TEST (First Year, Second Year & Third Year MBBS)  on CENTRE 2 (not available on Apps)

10 days to DNB

Attend the next (6thDNB CET Intensive conducted on 22 and 23rd of June 2015 on CENTER 1 or on Apps.

Read more about DNB Intensive.

New DNB CET Subject Weightage.

DNB CET 2 major changes

G2M High Yielding Topics for Medical PG will cover the most important, frequently repeated and the most likely topics and new advances in a series. G2M H-Y-T series offers guidance for AIPGMEE 2016, AIIMS May 2015, AIIMS Nov 2015 and DNB 2015 exams and leads to use the platinum access.

HYT 027 –  Genetics

NEW AIIMS May 2015 MCQ Included below.

There are 130 AIPGMEE MCQs, 95 AIIMS  and 77 DNB CET MCQs for you to revise today with the keyword ‘chromosome’ on Platinum access.

Genetics is a broad topic that is important in all subjects and all chapters Hence it is best not to see it as a chapter of General Medicine. It is often difficult to see the questions from these topics in one place. But you could use platinum access to screen for key word ‘chromosome’ to cover a good number of high yielding questions. This is a must revise topic prior to your exam. 

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Answer the MCQs below and see the popular answers. Don’t forget to check the correct answers and explanations.

The phenomenon where subsequent generations are at risk of earlier and more severe disease is known as:  (AIIMS MAY 2015)
660 Candidates
76 Candidates
42 Candidates
None of the above
45 Candidates
Presence of of two or more different chromosome constitutions in different cells of the same individual i known as:
10 Candidates
19 Candidates
601 Candidates
14 Candidates
ALL of the following are examples of common contiguous gene syndromes, EXCEPT:
Bloom syndrome
136 Candidates
Williams syndrome
321 Candidates
DiGeorge syndrome
41 Candidates
Angelman syndrome
51 Candidates
The references for the above questions were from the following:

Q1) Saenz M, Tsai A, Manchester DK, Elias ER. Genetics & Dysmorphology. In:Hay WW, Jr., Levin MJ, Deterding RR, Abzug MJ. eds. CURRENT Diagnosis & Treatment: Pediatrics, 22e

Q2) Jameson J, Kopp P. Chapter 61. Principles of Human Genetics. In: Longo DL, Fauci AS, Kasper DL, Hauser SL, Jameson J, Loscalzo J. eds. Harrison’s Principles of Internal Medicine, 18e.

Q3) Cunningham F, Leveno KJ, Bloom SL, Spong CY, Dashe JS, Hoffman BL, Casey BM, Sheffield JS. Genetics. In: Cunningham F, Leveno KJ, Bloom SL, Spong CY, Dashe JS, Hoffman BL, Casey BM, Sheffield JS. eds. Williams Obstetrics, Twenty-Fourth Edition.

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How to use platinum access to cover High Yielding Topic (H-Y-T) 027: Genetics?

You can create a ‘MY TOPIC‘ in the study panel and name it ‘Genetics AIPG‘ or ‘Genetics AIIMS‘. Use keyword search to create a HYT. Search for ‘Chromosome’ and click create test. This will be saved a HYT for your future revision too. Get platinum access instant subscribe. 

How to create HYTs on Study Panel for AIPGMEE, AIIMS PG and DNB exams?

Make sure you have selected AIIMS, AIPGMEE or DNB as package on Study Panel.

Screen Shot 2015-03-15 at 11.05.42

Step 1: On study panel click on My Topics (My Tests).

Screen Shot 2015-03-13 at 16.13.26

Step 2: Click Create New

Screen Shot 2015-03-13 at 16.15.52

Step 3: Give Test Name ‘Genetics AIPG’. Type under keyword filter‘Chromosome’. You have 130 questions today on Chromosome for AIPGMEE alone. Do the same for AIIMS and DNB later.

Note: Keyword is Chromosome


Step 4: Generate Exam will save your topic for future.

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AIIMS, AIPGMEE, DNB and all state PG entrance groups now subscribed via G2M Chat Park.
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This article covers DNB CET Scoring Tips, DNB CET Results Improvement and 3 Tips for DNB CET Preparation with insights into the complicated scoring system. Stay with GateToMedicine for your success in upcoming exams.

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