Which overplapping is stronger s-s or pp I know u will say pp bcz of the extent of overlapping but I want to ask that ss bond are more close to the nucleus than pp bond so they should me more stronger why it is not???

Strength of any bond depends upon the length of the bond.

Let's take an example of a stick which stick is easier to break a longer one or a shorter one, obviously the longer one.

Similarly, Longer the bond more easy to break, shorter the bond more difficult to break.
Since s-s bond are the shortest hence strongest than s-p or p-p bonds.

Please note s-s bond are close to nucleus to a limited extent as after that inter-nuclei
repulsive force are being generated. They can't go closer beyond that extent but that doesn't mean it is making the bond unstable.