Hello Sudeep, KCET is the state level engineering entrance exam of Karnataka. It has been noted that there is a certain trend in questions that such exams follow, so if you only depend on the previous year's question paper you can fare considerably well and score around 30-40% provided that at least your basic concepts are clear to certain extent. Since engineering is purely based on concepts which should be crystal clear to succeed in any exam I suggest you go through important topics while preparing especially chemistry for your last minute preparation. Rest lies in your hand!

Best of luck!