Hey!
I assume you are askimg about DU BEST OF 4 SUBJECTS so i would like to inform you that CONCEPT IS A BIT COMPLICATED PROCESS  AND REQUIRES HIGH ASSISTANCE .

The Best of Four subjects need to include the following -
One language (Core/Elective/Functional)

One subject in which admission is sought A candidate needs to include the subject in Best of Four, in for the Honours programme in which admission is being sought, otherwise a disadvantage of 2.5% will be applicable to the calculates Best of Four percentage (For example, if candidates are seeking admission in B.A. Hindi, they must have Hindi as a subject in their Class XII. If candidates belong to, say, PCB stream, they will have to bear a deduction of 2.5% from their Best of four aggregate marks.

Any two other academic/elective subjects as per List A If a candidate doesnt include the subject as enlisted in List A, then a disadvantage of 2.5% will be imposed on the Best of Four calculated.

List A includes the following disciplines offered by the University of Delhi for admission to the three-year undergraduate programmes must be treated as Academic/Elective subjects. All the discipline subjects must have at least 70% component of theory and 30% component of practical. Theory component doesnt include internal assessments or continuous evaluation.


LIST OF SUBJECTS :

https://university.careers360.com/articles/delhi-university-admissions-how-calculate-best-of-four-marks#DU-Best-of-Four-Subjects--Concept



IMPORTANT POINTS TO KEEP IN MIND WHILE CALCULATING BEST OF 4 MARKS :


Candidates interested in taking admissions for an Honours Programme in the University will have to include the subject (the subject in which admission is sought) in Best of Four subjects (One Language and Three subjects), failing to do so will result in a disadvantage of 2.5% in the best of four marks

Accountancy will be treated as equivalent to Commerce wherever any board does not offer Commerce as subject.

Biology, Biotechnology and Business Studies will be considered as academic/elective subjects.

Candidates seeking admissions in Honours programme of subjects Music and Physical Education will have to include the respective subjects in their best of four, failing to do so will result in a disadvantage of 2.5% in the aggregate of marks of the best four subjects

The subject Information Practices will be considered equivalent to Computer Science for admission to B.Sc (Hons.) in Computer Science only

Candidates seeking admissions to any Honours language course will be offered a 2% advantage over others if they have studied the elective language

In case, the candidate has studied both elective and core in any languages, the core language will be treated as a language, while elective language will be considered as an academic/elective subject

Admission to BA (Hons.) in Hindi Patrakarita and BA (Hons.) in Journalism will be based on Best of Four subjects percentage as in BA (Hons.)Hindi and BA (Hons.)English, respectively

Business Mathematics will be treated as equivalent to Mathematics for admissions to B.Com (H) / B.Com only

In case, if more than one no-listed elective/academic subject as notified by DU is included for 'Calculation of Best of Four', a disadvantage of 2.5% each in 'Best of Four' will be levied for admissions to BA/B.Com, besides a disadvantage due to change of stream

Legal Studies will be treated at par with academic/elective subjects for the purpose of admissions to BA (H) Political Science

Mass Media Studies will be treated at par with academic/elective subjects for purpose of admission to BA (H) Journalism (English/Hindi)

Admission to BA (Hons.) Applied Psychology will be based on Best of Four subjects percentage as in BA (Hons.) Psychology

Admissions to BA (Hons.) Social Work will be based on Best of Four subjects percentage including one language and three academic/elective subjects as per List A

Candidates will only need to have studied and passed Mathematics at the qualifying exam level for admission to Honours in Economics and Commerce

If a candidate seeks admission to Honours in any language programme, which he has studied as the elective language at the qualifying exam level, an advantage of 2% over the other candidates will be offered in the Best of Four subjects

In case, a candidate has not studied the language at the qualifying exam level and is seeking admission to Honours in that language will be liable to a disadvantage of 5% in Best of Four subjects

Candidates seeking admission to Honours in English and Hindi, the candidate need to have studied and passed the respective language in the qualifying exam and will need to include the same for calculating in Best of Four percentage

If there is any case of change of stream, a disadvantage of a maximum of 5% may be imposed on the Best of Four percentage. Moreover, the college will have to notify the actual deduction of a maximum of 5% on their websites and intimate the same to the University

If any candidate seeks admission into BA Vocational only, related vocational subjects will be treated at par with academic/elective subjects

A maximum of two vocational subjects can be included for 'Calculation of Best of Four', for admissions to Vocational Courses

If a candidate opts for Modern Indian Languages (MIL) except Hindi as a programme, an advantage of a maximum of 10% may be given in the Best of Four percentage in DU 2020 colleges where MIL is being offered as a programme

Likewise the last year, the basis of selection for Mathematical Sciences, Science, Home Science programmes remains unchanged. However, subjects to be included for the Basis of Selection, i.e., PCM/PCB/PCMB need to have at least 70% component of the theory exams, which dont include the internal assessments and continuous evaluation in the qualifying exam, otherwise a disadvantage of 10% of the maximum marks may be levied on each subject..


Good Luck..!