GLA University

GLA is a deemed university and KIET is a college affiliated to AKTU, Lucknow. Both the institutes are good in terms of ranking. You can choose the one in which you can get the desired branch.

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.