Hey,
KCET rank will be calculated by considering the performances in KCET and QE (qualifying examination) as well. Since you have scored 74 in KCET,then your percentage score in KCET will be around 41.11  Now,your KCET percent score and the percent score of your last qualifying exams will be added and Rank(R) will be given through this formula:
R={(%KCET+%QE)/200}100 So,your probable rank is around  68.05.
The cutoff however changes every year depending upon the difficulty level of the exam,number of candidates,category of the candidates.
You can go through KCET College Predictor tool to analyse the college you can get at your score:

Hope this helps.
Good luck.

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