NOTE:

Full course link :- https://www.youtube.com/watch?v=rfscVS0vtbw

These videos will clear all your basics, however to tackle questions in PAT/CAT/FAT you must solve problems regularly on all the above mentioned topics. The platform I found the best for this is Hackerrank. https://www.hackerrank.com/domains/python

Python and IDE Installation https://www.youtube.com/watch?v=SZUNUB6nz3g

Basics of Python https://www.youtube.com/watch?v=DWgzHbglNIo

Operators and Expressions in Python https://www.youtube.com/watch?v=hecHkaSt4iY

If else elif https://www.youtube.com/watch?v=PqFKRqpHrjw

Loops https://www.youtube.com/watch?v=0ZvaDa8eT5s https://www.youtube.com/watch?v=HZARImviDxg https://www.youtube.com/watch?v=6vPHm7z_n0M

Strings https://www.youtube.com/watch?v=Ctqi5Y4X-jA

Regular Expressions https://www.youtube.com/watch?v=WQlKPdKVXfw

Lists https://www.youtube.com/watch?v=tw7ror9x32s

Dictionaries https://www.youtube.com/watch?v=ZEZdys-fHDw

Tuple and Sets https://www.youtube.com/watch?v=Mf7eFtbVxFM

Functions https://www.youtube.com/watch?v=BVfCWuca9nw

Recursion https://www.youtube.com/watch?v=XkL3SUioNvo

Sorting https://www.youtube.com/watch?v=Vca808JTbI8 (Bubble) https://www.youtube.com/watch?v=byHi41L9vTM (Insertion) https://www.youtube.com/watch?v=4CykZVqBuCw (Selection)

Searching https://www.youtube.com/watch?v=DE-ye0t0oxE (Binary) https://www.youtube.com/watch?v=UldZOLylez4 (Linear)

File Handling https://www.youtube.com/watch?v=M-t4ILRHnxE https://www.youtube.com/watch?v=N8X-fhGLkoM