ANSWER:

It’s valid. 

Isha (4 rakah) is valid and witr is not part of isha.

https://youtu.be/ny73kP0XSSs

Is my prayer valid if i only pray 4 rakat fard for zuhr and only 4 rakat fard and 3 rakat witr for isha?

Prayer | August 17, 2022 11:30 am
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In my little knowledge I Know, in Islam, it is said that when we will do zikr, there should be movement of the lips. But when friends are sitting together or walking on the road or while sleeping at night sometimes is not possible to movement of the lips. So, if this kinds of situation,we do zikr without moving lips it will be valid ? May Allah bless you Sheikh.
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I have my board exam next month,i cannot recite surah fatiha with proper pronouncation,i cannot pronounce the letter daud ,also i don’t know how many mistakes i made in surah fatiha.once my exam finishes i will get a quran teacher and fix my recitation then, can i wait for these long to fix my recitation, as i am busy studying for my test