GLA University

Yes, it is necessary to take GLAET exam for getting yourselves enrolled into GLA University.

You may fill the form after January when they will be available. They can be filled online on the GLAU's official website http://glauniversity.in/EduwareHome/Home.aspx#. The forms are always filled online and the exam too takes place online . The exam takes place in the month of February to April and even beyond if their are seats available .
The exam is pretty simple and requires just basic knowledge of the subject. You may choose your spot of time as per your preference on any day. I hope that the answer was helpful. Best of luck!!
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You can try IMS Noida for BBA. It is in the top 5 ranked college according to the India Today magazine of June 2017. It has good infrastructure as well as faculty from IIM.

You can contact their administrative department. They will tell you the actual process.

You should opt for CSE in GLA in collaboration with IBM. It will be a better choice and you will be exposed to better career avenues.

G.L Bajaj Institute of Technology and Management is better. It has been ranked 1 by NIRF. It has Microsoft innovation center and Apple innovation center. It has 100% placement record.

Government jobs are not dependent on any university or college as each of the government post has its own entrance exam. Hence, make sure your percentage is good so that you are eligible for almost all the entrance exams.

You're so right with your intuitions. The college provides average placements and have very strict rules to follow for four years. There's a compulsory dress code, hike in fees and it won't be easy to score for internals.