I am trying to render this but i don't know why the scene light and world are not visible ...
img1 -- preview of render
img2 --- actual render
#scene world and light not visible
regal willow
regal willow
If you've setup all your materials in Material Preview Viewport Shading mode, then by default, your World Properties and lighting won't match your final render.
Material Preview Viewport Shading mode means you have "fake" lighting from an EXR/HDRi that it uses purely for basic previewing.
To get Material Preview and your final render to match, you need to add an Environment Texture in World Properties to light your scene.
If you're happy with the Material Preview look, you can match it by adding an Environment Texture. Go to World Properties panel, click the Yellow dot next to the word Color and select Environment Texture from the list that pops up (https://imgur.com/54gkUhr), then find forest.exr from (for Windows so you may need to alter it depending on your OS): C:\Program Files\Blender Foundation\Blender 3.0\3.0\datafiles\studiolights\world (alter 3.0 to whatever version you use).
The Environment Texture will add some light to the scene and the rest is any additional lighting you've added.
In future, to see more accurately what your final render will look like, choose Rendered Viewport Shading mode whilst you do look development.