Smallcap momentum portfolio

Hi Viswanath sir, Thanks for your patience in updating the thread and answering all the questions. I have a few questions.

1. When do you enter and exit the stocks. After market opening on 1st day of the week, as the screening is done over weekend?
2. Did you face a situation where the buy stock is already on Upper circuit? What do you do in this case?
3. Did you face a situation where the exit stock is already on lower circuit? What do you do in this case?