Dear Pradnya, IBSAT never reveals your percentile or individual subjects score. When you are selected it is based on that year's cut off and how well you have cleared the cut off. You will also receive an application form, attachment of brouchure and selection process. The  letter means that you have cleared your first round. The application form is for further rounds. You will have Group Discussion and Personal Interview rounds after this. If you clear these rounds, a merit list will be prepared and final candidates list will be released by March. If your name is mentioned in that final list, only then you have been selected for taking admission in their University.