Colleges in Chandigarh

Check with the eligibility criteria at the site of the college or university and check what the eligibility they have taken are:
https://davchd.ac.in/
As you have not mentioned the region so this link is for Chandigarh.

Yes, CAT is necessary for admission into MBA programs. They may also accept other management aptitude tests.

LPU is a globally well-known university, and it is a good choice reason being they have good tie-ups with corporate houses, foreign universities, NGO's which are actually very important for networking and getting placed. Infrastructure is good too. You will find cultural diversity that will give you exposure. You would be meeting people from different countries and get to know about their culture, tradition which will help you to grow as a better person. In addition to this, the scholarship is also given to meritorious students.

New opportunities lean with the industry. Enroll now for 2019 Batch. 70% Repeat Recruiters. 95% Placements in 2018. 8500+ Students Placed. Sector-Focused University. 500+ Faculty. 850+ Companies. QS Five Star Ratings. 1064 Recruiters. Courses: International Business, Human Resource Management, Marketing Management, Financial Accounting, Operations Management. Science, Commerce or Arts students; 50% in Grade 12No entrance exam, only Personal Interaction.

You may contact the college admin for the same. To know about the course, you may refer:
https://www.shiksha.com/science/course/b-sc-hons-in-biochemistry-panjab-university-chandigarh-14306

Your scores are not bad and hence there are some chances for you to get admission. Since the competition is too high, it is difficult to say with assurance. Hence, you may try your best at the time of admission.
All the best.

Yes, it is. Actually, you need to clear the exam and entrance. All the best.