CAT Preparation

Verbal section consists of numerous numbers of words that you are unaware of like parsimonious, anachronism, cryptic
first learn the vocabulary then implement those words in your spoken English then try to read as much as you can the interested topics to keep your focus on.
After vocabulary, learn grammar. You will perform well if you do that.

There isn't anything like online group interview, as far as I know in the selection process. Sorry for the inconvenience, but if there's some other question or elaborated question, I will be happy to answer.

You can definitely prepare for CAT and if you prepare well you might even get 99+percentile. But, even then getting into an IIM will be quite difficult, because they give a significant weightage to your past academics as well. But, there are also some very good institutes at par with the Iims, who do not give that much weightage to your past academics, provided you have a good profile and a very good percentile in CAT.

Start by solving Maths problems given in previous CAT exams (You can find books containing the same).
The rest can be covered easily while preparing from an institute.

Preparing for CAT, you must concentrate on Logical Reasoning, Verbal and Quantitative Analysis. All the sections are equally important. You must practice giving as much mock tests as possible. Work on the weaker portions and increase the efficiency of the stronger ones.

If you manage to get preparation along with your job then it is the best option for you. But if you won't be able to do that then you could go for it. Preparation for GATE is a good choice for you to get admission in IIM.

A percentage at 85% and above will help you to get into IIMs.

Yes, you can prepare for CAT. You can take tuitions for CAT. There, you will be taught everything from the basic. Else, for your English, you can take a short-term coaching class before starting your CAT preparations for being more confident.

Hello,
Erudite and Time Coaching are the two best coaching for CAT Exam preparation. You can join any one of them for better career.

Best institute for CAT preparations in Delhi are:Mindworx,
Career Launcher,MBA Guru
Ganit.
You can do your CAT preparations from one of these institutes, as they provide good facility and faculty to the student.