This is not good for Samaina. You can bash me if you want. But based on what they are showing...this can result in
1. Arjun feels guilty about stealing papers and literally taking away the right from Sameer. It could have been Sameer getting selected had Arjun not stolen. So he may blurt it out and Sameer will hear it...and Sam will be devastated...
or
2. Arjun may still ty to prevent Naina from dating Sameer. This might finally make Naina speak up against Arjun. She may blurt out that Sam has done so much for them and all you did was blame was steal the papers and put blame on him. It was your fault that Sam had the bet , etc..etc...Sameer will hear it...and will be devastated...
What comes next I will leave it to everybody's imagination...but the girl's brother being villain was common in the 80s and 90s films.
Naina will end up disliking her dad and Arjun. May be that is her ticket to maturity...and finally standing up for Sameer ...in distant future...