Conditions for the validity of Salaah

Performing Asr Salaah before azaan

Q: I want to ask that I live in Karachi and the asar time in my city starts from 3.27pm and the adhan for prayer is being called off by 4.15pm but I am a student. I have to go to coaching to take my classes and my class starts from 4.15 to 5.00 and there is a 5 minute break but in that 5 minute break there is such a rush of people so I am not able to pray my Asr Salaah and the next class begins from 5 - 5.45 but at 5.45 it is time for Maghrib. Can I pray before adhan is called?

Leaving the lesson and performing Salaah

Q: I am taking an online aalimah course and because of time differences, South African time goes from before maghrib 6:00 to 8:30 after esha has already set in. The asaatizah have told us that we should leave for salaah and catch up with the missed portion of the lesson later.i.e. We definitely shouldn't miss our Salaah for classes. Our first lesson completes at 7:00 or 6:45 depending on subject and day. Can I wait for the first lesson to complete and then read my maghrib Salaah before the next subject or should I immediately leave the lesson and catch up later?

Facing the wrong direction when performing Salaah

Q: A family moves into an apartment, they use a well known Qibla finding app to locate the Qibla direction and pray. Months later a neighbour points out that the direction is wrong and they must face the other direction. The difference is about 90 degrees apart. What happens to those Salaah that were prayed in the incorrect direction, are they valid or do they need to be repeated?