please, check my mistakes

[happys82]

According to the branches, National Team Selection Test is held in different dates.
*Students selected for the national team, are invited to the national team camps.
*The exam of each branch is taken in different countries each year.
*Average of 50 countries from all branches participate in this examination.
*According to the results,students who got grade are awarded GOLD, SILVER, BRONZE medals.
What are the ways to succeed in the Olympiads?
*Good planning,
*A good application
*Good estimation and complete missings

 

[Rosamond00]

According to the different branches, National Team Selection Test is held on different dates.

*Students selected for the National Team[STRIKE], no comma[/STRIKE] are invited to the national team camps.

*The exam of each branch is to be taken in different countries each year.

*An average of 50 countries from all branches will/are to participate in this examination. (for the sake of consistency it is recommended to use either "exam" or "examination")

*According to the results,students who get high grades are awarded GOLD, SILVER,
and BRONZE medals.


What are the ways to succeed in the Olympiads?
*Good planning.
*Good application. (follow a parallel pattern since this is a list)
*Good estimation and complete missings.:?:


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That is how I would have written it, but I'm neither a teacher nor a native.

 

[happys82]

thank you very much