I'm in RMG & allocated to a project for client evaluation/intro What will be discussed in the client call? Can the client reject my profile?

Client evaluation is not just about technical aptitude but you as a person. Your work ethics, your experience with development methodologies like Agile or stuff like that. They want to see if they're going to work with a reliable person or not.

Client evaluation is basically an interview with client where you'll be be evaluated on technical and prior experience. They want to check if your basics and concepts are clear and if your prior experience is relevant to project needs.

Check with the project team on what's expected in the client evaluation and prepare accordingly