JEE Main 2021 examination is being conducted for the candidates who are willing to pursue the Engineering courses in 2021. While there is no doubt that it has been referred to as one of the toughest and highly competitive exams in India. However, our goal is not to frighten the candidates but to help them understand the technique through which the MCQ answers can be guessed correctly.
Students must be aware that this examination is an objective type paper having multiple choice questions with four options to choose. While it is true that selecting the answer does not require you to give any explanation, this actually means that you just circle the correct option and nobody can know if you understand the concepts or not.
With that said, answering every question considering yourself lucky can be a wrong tactic as there is negative marking as well. However, if you don’t know the correct answer, sensible guessing can help you eliminate all the wrong answers and obtain marks.
In major exams, answers are equally distributed among all the four options i.e. a, b, c and d. It means that 25% of answers are ‘a’, 25% are ‘b’, 25% are ‘c’ and the remaining 25% are ‘d’. This makes sure that even if someone selects one option throughout the examination, only 25% of the exam would be correct and the rest of 75% would be incorrect. Thus, the candidate will get zero marks in the exam, thus, no one benefits from a high count of answers in one option.
15 Tricks to Guess MCQ Correctly in JEE Main & JEE Advanced                                                                             
1. Stay away from the Highest and Lowest values
For questions having numerical values in the JEE Main exam, it is always important to stay away from the extreme values. For 60% cases, the highest and the lowest values are wrong.
2. Elimination
There are many instances where a candidate attempting JEE Main has to face a question with already two crossed-out incorrect answers. This means that there is guesswork possible on one of the two options in which you are confused.
3. Questions with No Negative Marking are a Must Attempt
Questions involving ‘Match the Following’ or other similar questions that do not carry negative marking must be attempted. The candidates are in a safe zone with such questions. Leaving such questions unattempted is wrong on the candidate’s part.

4. Units and Values
Another vital but straightforward trick is that several questions can be solved just based on units and values.
Let’s say, options are:
● 60 o K
● 70 o C
● 60 o C
● 50 o C
With three options mentioning degree Celsius, we can eliminate a; now, since value 60 has come out twice, it will probably be the correct value. This logic works in 80% of the cases! Thus, we can choose c as our answer here.
5. Domain and Range of a Function
Questions related to finding the function domain and range can be the game changer to score highly. These questions are asked in IIT JEE. An example is given below:
If x = {0, 1, 2, 3, 4}, y = {2, 3, 4, 5} and x X, y Y, then which is a set from the following functions given below?
f1 = {(x,y) : y = x + 1}
f2 = {(x,y) : x + y = >5}
f3 = {(x,y) : y ≤ x}
None of these
For such questions, don’t solve the entire function. Students will have put in the set’s extreme values in the function and check if they satisfy the answer. For this specific question, you can put 2 and 5 for y and 0 and 4 for x. The correct answer will be – (d) in this case.
6.Dimensional Analysis is your Friend in Crime
One can quickly solve questions if there is awareness of the dimension. For example, if you have to find the velocity of an electromagnetic field with wired orientation, its field values are given as B and E. The options for correct answer is given below:
● (2B/E)
● (2E/B) 1/2
● (2E/B)
● (2B/E) 1/2
We are already aware: Dimensions of an Electric Field – (M1L1T-3A-1), Dimensions of a Magnetic Field – (M1L0T-2A-1)
Only E/B will give students Dimension of Velocity (L1T-1). A square root is not needed as it will lead to the square root of velocity as well. Thus, one can assume option (c) as the answer.
7.Putting Values to Narrow Down your Options
Use this trick for questions where the calculation is in need to find genera; expression to certain scenarios.
8.Finding out N-terms in Mathematics
This is perhaps one of the most straightforward questions in Maths. Here, the nth term or the sum or product of n-terms is asked. The value of ‘n’ is mostly 1, 2, or 3. Put these values and check if they fit in. The tip-over here is that if you have tried up to ‘3’ and still do not get the answer, move to the next question as it will take up a lot of time to figure out.
9. Generalize Questions
Questions having complex orientation will require the candidate to find one of the variables. In this case, we assume that two or more of the arbitrary values are zero, one or some other are easy values.
10. Easiest Topic that fetches you 20-25 Marks
Modern Physics with atoms, nuclei, radiation can fetch as much as 20-25 marks in JEE Main. It hardly needs more than a day or two to understand these topics. It only requires one-tenth of the preparation time you need for Mechanics but fetches you ten times the marks.
11. Diagrams for Co-ordinate Geometry
Drawing an approximate diagram helps in mapping out the radius, area, equations, etc., quickly.
12. Kinematics and Trigonometry can be ignored
To study such topics, a candidate would need a few weeks to master these two topics. Since there are only 2 or 3 questions in the JEE Main exam, invest the same time in other topics that can fetch 20-25 marks. So wisely choose the topics!
13. Chapter 1 of Physics from Class 11th NCERT Book
This is one of the most important tips as no one gives importance to this introductory chapter on Measurements. While it is easy, we see at least three questions from Dimensions, Approximation, and finding Maximum Error sections figure in the JEE Main exams.
14. NCERT for Chemistry
It is a fact that NCERT books are the soul of Chemistry questions in the JEE Main exam. While, in Maths and Physics, there are questions from other books, but Chemistry has every question from the NCERT. In the last few exams, some questions on Chemistry are directly quoted from JEE Main exams.
15. Let the Mind rule for Once!
JEE is about testing the Intelligence and not the Intuition. Thus, letting the mind decide which answer to tick for three hours is the best chance.
To conclude, we would like to highlight that no matter what happens, never lose your confidence, whether during an exam or after the exams. Keeping yourself motivated is of the utmost importance. Besides, one must take good care of their health in this pandemic to stay fit before the exam.