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You can pick an OS between Windows or Ubuntu. As majority of Indian colleges operate on Windows, there are few colleges which operates on Ubuntu. I haven't seen any college operating on Mac. So, it is better to stick with the technology used in your college. If you want to learn programming languages which you will be studying in your BCA course then you can check out this app "BCA - Course Programming" which is specially designed and developed for BCA students and is available on Google Play Store. It has programs and assignments of languages like C, C+ and Java with their outputs. You'll be studying these languages in your 3 years of BCA.
https://play.google.com/store/apps/details?id=technark.bca_courprogramming

Dear Rishikesh, Being alumni of LPU, I would be sharing the details of eligibility for the B.Tech in CSE programme at LPU. You should have a minimum of 60% marks in the 12th class with mandatory subjects English Maths and Physics. Moreover, you have to qualify for the either LPU NEST exam or should have a minimum of 85 percentile in the JEE Mains exam. I did MBA from LPU and one of my friend's younger brothers is also studying over there in B.Tech CSE. There are a few parameters I would like to share with you why CSE is good at LPU. Great Placement: LPU has a good placement record for CSE students. Every year more than 500+ companies including national and multinational companies visit LPU for placement. A few of them are Microsoft, Amazon, Adobe, etc. In which they are placed. The maximum package availed for CSE is 42 LPA. PEP Classes- LPU provides placement classes to all the students from the very first year who opt for the placement. These classes help students for placements so that they can get selected in the pre-final year because the companies will start visiting for the recruitment of students from a pre-final year. Some of the students go for internships also in their final year. The Knowledge Review has rated LPU as the 10th best Training & Placement Institution in India. Industry Tie-ups: B.Tech in CSE has tie-ups with industries such as IBM, Intel, Xebia, Upgrade. Comptia, Transorg, Geeksforgeeks, etc. That help students to explore themselves more in their field. Scholarships: LPU provides scholarships to bright students every year worth crore rupees to all the students based on their academics, extracurricular activities, and other factors. Specializations Offered: CSE students get many specializations while studying CSE to enhance their knowledge according to their interests such as Artificial Intelligence, Machine Learning, Cloud Computing, Cyber Security, Data Science, etc. LPU also offers B.Tech (Hons. ). In the CSE programme. Apart from this, many opportunities and scholarships are there in LPU while studying for bright students in academics and extracurricular activities. I hope this helps
Thanks.