Any advice on how to cope with the loss of a parent.?

So sorry for you loss. To answer your question the best answer is from God's word the bible. FEW things in life will ever affect you more deeply than the death of a parent. Not only do you have to endure the intense pain of loss but you are also left to face a future that will likely be quite different from what you had expected. Death affects each person differently. Indeed, the Bible says that “each one” has “his own plague and his own pain.” (2 Chronicles 6:29) With that in mind, take a moment to think about how your parent’s death has affected you. Below, describe (1) how you felt when you first found out about your parent’s death and (2) how you feel now.  Don’t hold back the tears! Crying helps ease the pain of grief. However, you may feel the way Alicia did, who was 19 when her mother passed away. She relates, “I felt that if I showed too much emotion, it would seem to others that I lacked faith.” But think: Jesus Christ was a perfect man who had strong faith in God. Yet, he “gave way to tears” over the death of his dear friend Lazarus. (John 11:35) So don’t be afraid to let your tears flow. It does not mean that you lack faith! Alicia says: “Eventually, I cried. A lot. Every day. 

Communicate your feelings. Proverbs 12:25 states: “Kind words will cheer you up.” (Today’s English Version) Keeping your feelings bottled up inside may make it difficult for you to deal with your grief. On the other hand, discussing your feelings with someone  you trust will open the way for you to receive “kind words” of encouragement when you need them most. To help start a conversation, try this exercise: List two or three things that you wish you could have known about your deceased dad or mom, and then ask to discuss one of these with your surviving parent.  Talk to God. Likely, you will feel much better after you “pour out your heart” to Jehovah  God in prayer. (Psalm 62:8) This is not simply a ‘feel-good therapy.’ In prayer, you are appealing to “the God of all comfort, who comforts us in all our tribulation.”​—2 Corinthians 1:3, 4.

Grieve time will heal 

My condolences. I suggest that you donate or throw away any items left from your mother. This will ease the grieving process. My mother died when I was a teenager and this is what I did with her personal items. She never had much anyway. 

I lost my beautiful daughter. Yes I grieve. But it helps me to think that she is not “gone”, she is just in a different place than I am. I am a believer in Jesus Christ and Heaven, and so was she. She is not gone forever, she is in Heaven having a beautiful time, and someday I will join her.

It's very likely you'll never get over it.

Each day it will be less.

I'd like to give you my own advice but I think I should leave it to an expert.  Authoritative Guide to Self-Help Resources for Mental Health, which rates books based on polls of more than 3,000 professionals, gives its highest rating to this book in its chapter on grief.

If you read the readers' reviews, you'll see how much people appreciate the book.

https://www.amazon.com/Survive-Loss-Love-Peter-McW...

I'd like to mention something that psychiatrists say. Although grief is not the same as depression, it can lead to depression. In the weeks ahead, it would be a good idea to know about a good screening test you can use online. I suggest CESD R, or KADS 6-Item if you're a teenager. I have advice from experts about depression in my answers. There's a lot of things that can help.

I recommend a book <Journey into now>. Maybe it can help you come out of sadness.

Please talk with a counselor at https://www.hopefortheheart.org/

Reading "The Great Divorce" by C. S. Lewis might help, too.

My condolences to You and your family

You never get over it. You get use to it.

You should grieve. You should remember her and be thankful you had her as a mom.

It will get easier. At your own pace you will learn to accept it. When you incounter things that remind you of her she'll pop in your head. Smile. You had the privledge of knowing her. She will always be in your heart.

After a month, 6 weeks if you do feel you are having an extraordinarily hard time of accepting this I urge you to seek counselling.

Worry about her stuff when your head is in a better place.

Best wishes