ANSWER:

Follow the Umm al Qura prayer timetable and pray accordingly, no matter when the athan is called.

In my country fajr start around 3.34 AM & dhuhr 11.56AM (I took this time from internet) . But the adhan for fajr is given on around 4 AM & dhuhr at 1.20PM. To pray salah should I wait for the adhan to be called or I can perform salah as the prescribed time begin?

Prayer | June 20, 2020 8:04 am
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In zohar prayer imam made a sajda sahu apparently without any reason .later i asked him the reason he told me that in first tashahud he read whole durood or part of it and then realised and immedeately stand for third rakah . Does that require a sajda sahu , i think no.
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What should a person do if he joins the prayer when the imaam has alredy finished one rakat and at the end the person forgets that he had missed one rakat and finishes the salah with the imaam, does he have to repeat the whole salah or not?