Does Quran tell to recite any particular surah to cure atuism?? My son is 3 and half years old and is autistic.

*** tell me wazifa for marriage

Bismillaahir-Rahmaanir-Rahiim.
First of all, there is in my knowledge nothing called `wazifah` in the Quran or the Sunnah. So let`s not innovate. And Allaah knows best, but there are imams that have been leading people astray ever since the time of sohabah, so don`t just take everything people say and do as a part of Islam. There does exist what you call ruqiyah (that you recite Quran or listen to it trusting in Allaah to cure or protect you or driving out shaitaan), and even it according to a hadiith is better to avoid, and just trust Allaah. And reciting Quran is always better than using your time for vanity, but why wouldn`t we just read The Book of Allaah because we love Him? It seems we only turn to Him when something`s wrong, and when everything`s okay we even forget to thank Him, and people go to make shirk in stead -may Allaah protect.
For fulfilling your needs from Allaah you have the most powerful thing, which is du`a asking directly from Him Alone, tawakkul to Him Alone, and yaqiin. 2 raka`ah and du`a was the way of sohabah. And there are times, when du`aa is better excepted. You as a mother should believe in the promise of the messenger of Allaah -sAaws- that the parents du`a is accepted without doubt. If you were not the mother, I`d be advicing you to go to the child's mother or father and ask them to make du`aa, because there is no doubt Allaah will accept it. And when you are fasting (saum) and doing good deeds according to Sunnah sincerely for Allaah, du`aa is even stronger.
But I want to also remind us that being patient with the qadar of Allaah is something more preferred. For example Allaah`s Messenger -sAaws- told a woman -rA`a- who had epilepsy that if she wants, Rasuul -sAaws- would make du`a for her, and if she likes to wait for better in the aakhirah, that she makes sobr. Then she asked him -sAaws- only to ask Allaah that her `awrah doesn`t uncover. Another sohabi -rA`a- in jihad lost his eye, which was hanging out. Rasuulullaahi -sAa`ws- said the same as to the woman, so his reply was given in his action that he ripped the eye of and stepped on it, and returned to jihad. This is how much sohabah had love for Allaah and meeting Him that they often didn`t choose the ease of this world except if they could attain by it the akhirah. And being patient and content with what Allaah has decreed is a sign of eemaan, a means of worshiping Him, and leads to attaining a higher status in Jannah.
Of course you ask from Allaah everything of the good of what you need in dunja, but don`t forget the akhirah. And call Him by His Names, humbly, with fear and hope, and with determination. We are all in need of Him, and He is Al-Qhaniju Al-Hamiid.
And Allaah knows best.
It may not be that autism is bad for him. It`s just a genetic disability. At least Allaah will not require
From him what is required from a strong healthy person. But everyone is tested. I hope this helped you.
Salaam.

Best thing is to tell your father you want to marry, ask him to make du`aa for you, and look for you a good husband. As a father that`s what I`d expect from my daughter, and I would count on Allaah. Allaah knows your situation, and I don`t. But if your father is a religious good sunni muslim who doesn`t make du`aa to anyone along with Allaah, this is definitely my advice. And Surat Jasin is always easing everything by the permission of Allaah.

Not to my knowledge. My child is autistic and my Imam has told me to pray for guidance, and strenth, but not for a cure.

Allah is in control. And there is a reason these children are born with this gift.

May Allaah bless you. See: "this gift". Allaahu akbar. I just told my daughter today when she said she would have liked to spend time with me in a different way than doing chores, to repeat what the Messenger of Allaah -sAaws- is reported to have said: "wa rdha bi maa qusima laka takun aqhaa an-naas" (Be pleased with what you have been given. You will be the richest of people). She did and she smiled, and she said now her face is shining because she`s happy.