In regard to CBSE class 12th Mathematics Examination, more critical pre-examination analysis of question papers should be done by CBSE (which recklessly changes its paper-pattern every two years keeping at stake the future of students with its experimentation). 
It is a certain concept that filling of OMR sheet properly consumes time in itself. Keeping this in view, it is still mandatory for students to fill the options that are marked as choice and not necessary to attempt. Besides this unreasonable practice, it is well evident that the questions which generally would carry 3-5 marks were present in an exam considered to be 1 mark per question and the time limit was also set according to the 1 mark questions. The idea for us, students is nothing less than preposterous. The exam that should have been considered for at least 2 hours was to be solved only in 90 minutes along with the time consuming task of filling the OMR sheets. 
The official mathematics sample paper by CBSE is seen misleading as it had reasonable amount of time consuming question and reasonable amount of direct questions and well framed for the 90 minute time limit. Students, well set according to the sample paper felt nothing less than a slap on the face after seeing the question paper where the ratio of time consuming questions and direct questions was not balanced and the paper was not framed according to the given time limit (even the level of questions, though not too hard yet mind-wrecking, required some more time). 
Keeping in mind the length of the paper, types of questions asked (precisely the case study which needed a lot of critical thinking by students) and the fragile limit of time given to students, the matter should be considered by the higher ups of Education System in India. This is the petition of the students whose future is at stake, for the levels of admissions in colleges have risen up with the fast increasing competition and where each and every mark counts.