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I've provided enough details regarding cutoff to save you plenty of time looking around. Assuming you already know enough about the two exams, I'll just mention important bits to know the difference between the two exams better.
Number of applicants in COMEDK'18: 72,152 (against 20,000 seats, out of which 18733 are reserved for engineering)
Number of applicants in KCET'18: 1,98,639 (against 19942 seats, out of which 16942 are reserved for engineering)
Both exams are different in the following ways:
More competition in KCET, compared to COMEDK.
Tough COMEDK, easier to get a good rank, whereas the opposite is true for KCET.
COMEDK colleges more expensive than KCET (this is because COMEDK has more private affiliation) [53,460 (KCET seat) and 1,83,600 (COMEDK seat)]
Reservations for SC/ST/OBC high in KCET, more seats for GEN in COMEDK.
Outsiders not allowed to write KCET, whereas COMEDK is all-India EE.
Keeping the above points in mind, let's look at the cutoffs.
Generally, the closing rank in KCET for RVCE:
Civil: 3354
CSE: 573
ECE: 798
EE: 622
ME: 584
Now, COMEDK for RVCE:
Civil: 3199
CSE: 180
ECE: 390
EE: 732
ME: 829
From the above tables, we can suppose that KCET which see a number of applicants higher than that of COMEDK, but yet latter has a similar cut off as KCET but for less number of candidates. Although one can't exactly tell what should be your rank to be able to get a seat in RV college of engineering as the last year cutoffs can't exactly predict your chances as the cutoffs are based on so many factors so it isn't ever constant.
But to be on safe side, its best if you have:
Civil: 2500 (COMEDK), 2700 (KCET)
CSE: 150 (COMEDK), 300 (KCET)
ECE: 300 (COMEDK), 300 (KCET)
EE: 600 (COMEDK), 500 (KCET)
ME: 700 (COMEDK), 500 (KCET)
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This decade belongs to Electronics and Telecommunications. Electronics and Telecommunications will continue to impact all walks of life including business. Next wave of Industrial revolution is automation and Electronics will play a vital role in it. ECE engineers can be employed in all type of industries including IT. Computer Science is the facilitating technology for all business and personal activities. Indian IT industry is worlds largest outsourcing hub. Computer Science engineering is dominating the job market for last 15 years. Indian Computer industry has started showing an early sign of decline due to the outcry against outsourcing in the western world. Therefore, Electronics & Telecommunication is the best option with respect to career opportunities and scope. Computer Science will continue to good career option for some times in the field of Engineering. Mechanical is an ever green branch for last 50 years and will continue to remain same in next 50 years. Therefore, my recommendations in order of precedence are ECE, CSE and then Mechanical engineering if the student does not have any specific area of interest.

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Unless, you have personal constraints, you are advised to opt for full-time MBA.