Correction in sentences

Please correct my sentences.

Students write or note down these writing on the board and start writing with me or 1sec after.

(Here I mean I'll give them solutions and they should start writing along with me or 1sec after me. To carry out the giving and taking process synchronously).

She'll take a leave 1 day early before mentioned dates.

She'll be 1 early out before the mentioned dates.

(In a application for leave for marriage)

On the page on the notebook.

In the page in the notebook.

(What is the meaning of different versions).

What should I write in a application for leave.

I am Robert or I Robert. I work as a .........