How to remove first 3 characters from NSString?

You can use the NSString instance methods substringWithRange: or substringFromIndex:

NSString *str = @"A. rahul VyAs";
NSString *newStr = [str substringWithRange:NSMakeRange(3, [str length]-3)];

or

NSString *str = @"A. rahul VyAs";
NSString *newStr = [str substringFromIndex:3];