Colleges in Ahmedabad

Hi,
Product Design as a design field involves designing or creating products that will be used by consumers. Product Design is related to all the work that is done between an idea coming to mind and finally seeing the product in the hands of the customer. It is not necessary that a product designer always designs new products. Designers can also take inspiration from existing products or can also redesign and update existing models like in mobile phones we see every year.
Aspirants can pursue a course in product design at the Undergraduate as well as Postgraduate level. Since the question doesn't clarify which level, I'll be providing info for both the UG and PG level courses.
At Undergraduate level, initially there is an option for B.Des Product Design programme to start with, which is a course of 4 years duration.
After completing a UG level course, there is an option to pursue higher education. M.Des is a masters programme which is a Postgraduate level course that can be pursued for another 2 years to get excellence in your selected design field.
If you do not wish to pursue PG course, you can opt to pursue a job in Product Design just after completing your B.Des where the most common profile that you can fetch after completing such a course is to become a Product Designer. Later also you can pursue the masters and then you can grow your career in the field.
Some popular options you can consider for this course will be like NID Ahmedabad, Institute of Design Pune, VIT Vellore, IIT, Amity University Noida, IILM University Gurugram, Lovely Professional University Punjab, Symbiosis Institute of Design Pune, FDDI Noida etc.
At this time, one of the best option to consider would be IILM University Gurugram. Here you get the course with an added advantage of Liberal Education in their curriculum with good and advanced pedagogy in teaching. Its focuses on going beyond aesthetics and technical expertise helping students to design, create and inspire.
Today's designers rely on current market trends using innovation in digital technology blended with aesthetic solutions for a product or service and this you can well grasp from an international level institute only which operates with global collaborations. You can visit their website to apply for the programme or to enquire more.
https://iilm.edu.in/

You should start 9 months before the exam, although this might vary from person to person. Consistency is the key. You must practice and learn each section daily from whenever you start till the date you appear for your CAT exam. Identify your weaker section and donate more time towards that particular section. On a minute level also focus on which topics you find difficult and take a call on how much time you want to spend on it depending on its weightage in the exam.
WAT or PI is not difficult but not preparing for the same can be fatal. Make sure that your preparation is up to the mark and you know everything about yourself. You will be asked to justify whatever you say and whatever would be there in your application form.
Just be consistent and enjoy this roller coaster ride. Give your 100% and try to think as less as possible about the result.