Do you need to finish the main quest before you can play those other two modules.

I have played the first one, Kingmaker, twice and I can con't complete it on time.

You can play the expansions without the main game. What's stopping you from finishing it on time? The game gives you a lot of elbow room to beat the Stag Lord.

I am not too sure what is stooping me I am not good wt deadlines, I am glad you can play the expansions wt out finishing Kingmaker.

Sorry, I meant to ask where exactly you got stuck. I was going to try to remember what to do. I did manage find a guide when I needed help with Candlemere Lake. Maybe you'll find it helpful too:

https://www.gamerguides.com/pathfinder-kingmaker/guide/walkthrough/prologue/the-first-step-on-the-road-to-glory