Hey,
KCET rank will be calculated by considering the performances in KCET and QE (qualifying examination) as well. Since you have scored 70 in KCET,then your percentage score in KCET will be  around 38.88. Now,your KCE 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 62.94.
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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