Well let's analyses yourself before finding your merits and demerits. It's you who can relate your weaknesses and strengths. 

You don’t need to hold a very high quality merit for your selection. Just try to maintain a balanced merit.

Try to understand your qualities. You definitely have some good qualities.

You should be free and spontaneous. Do not be too assertive that you will have to get your selection.

Yes you can write this don't be too much assertive just say because of being a bad student teacher don't like me but for my punctuality they likes me too . Be truthful in a positive way. Why so negative man! as this is your chance to write about yourself focus on a constructive criticism. 

Try to express yourself in a positive way. Don't get always negative and in your viva if they ask you to confess these negative things then describe it. 

There is no problem of expressing the true fact but you should try to prayer regularly. Tell them the truth that you try to say your prayer regularly but due to some distraction sometimes you fail to say prayers.

Successful people don’t hesitate to tell the truth but share there critici's helps you to know your weakness and you work on these to your growth. This shows you're accepting criticism. 

You should be free and spontaneous. Just be yourself.

Never. Just acquire experience but you are a unique person. You have your own ideology and psychology. Don’t try to copy others. It will hinder your selection.