if you won medals at the national level yes you should mention it on CommonApp in the ‘honors’ section. You do not have to send certificates.
If you DID NOT mention those national-level medals on your application, find the international admissions officer at each of your college and email her/him directly TODAY, stating:
Dear …
My name is … … and I am an international student applying from (the UAE). It has been brought to my attention that I should have mentioned that I won 6 gold medals and 1 silver medal for International Mathematics Olympiads and 3 gold, 2 silver medals for National Cyber Olympiad, including … medal for the national competition.
I hope it is not too late for this information.
If you need a scanned copy of the certificates or a photo of the medals I will gladly send them.
Thank you.
Sincerely,
… …
@MYOS1634 , I will make sure I do it today.
By the way, I am not from UAE. I live in a country neighboring the UAE.
Thanks a lot! I really hope they consider this.
The (. …) We’re just examples. You fill those in with your own information. 
However for universities this caliber w school level or regional level Meeks wouldn’t matter so don’t mention them. What matters is competing nationally and ranking nationally.
Also, it matters what your goals are. As I mentioned, research experience is possible at a ton of American colleges.
So “good” can not be measured on a one-dimensional scale. For instance, most people would say that Oxbridge is more prestigious than UT-Austin, but a prof from one of Oxbridge was amazed at the research facilities and “toys” available at UT-Austin (which has more research money to spend than either of Oxbridge). This applies lower down the scale too. So for instance, an NIT may be seen as more prestigious than a UT-Dallas by some, but you may well get more opportunities to do serious research at UT-Dallas or American unis at that tier.
You may have to pay more for some of them, though others offer merit scholarships that are open to foreigners.
@MYOS1634 , I just realized that 1300 was my worst international rank. My best international rank is 78 but that was in 8th grade.
Anyways, I have emailed all the remaining colleges whose decisions I am awaiting.
I also mentioned the fact that since these olympiads were conducted by an India based organization, so they considered all international countries where they conduct olympiads as a national zone, so actually my national medal means a top rank in all countries except India.
I have this national medal in 5 out of the 6 times actually, and just one for being a school topper.
I do not know how I missed to mention such an important piece of information!
Thanks a lot @MYOS1634 for guiding me through this, and hopefully you may be the reason I might have that slight possibility of going to my dream colleges!
@Justoneofthelot - However your admissions experience turns out, it would be a great help to students like you at your high school, if you let them know that they cannot rely on admissions statistics for US applicants at US colleges and universities. They need to dig deeper and find the information about international applicants. Except for places that admit all students solely on their stats (and that is published right on the website if it is the case), a general rule for them to start with is that what would be a safety based on stats for a US applicant, would be a match for an international applicant who has no financial need, and what would be a match based on stats for a US applicant, would be a reach for an international applicant who has no financial need. One good source for recent information about admissions fro student educated where you live would be the closest office of AMIDEAST or EducationUSA.
You have a good profile. If you don’t need to worry about aid, there are a number of rolling-admission public universities that might offer you the research opportunities you are looking for. Check the application cut-off dates at a few more of the public Us mentioned here, read through their course offerings, and see what you think.
I emailed the colleges to include my Olympiad achievements in their files.
Surprisingly, MIT said they would add it to the file 
. I just hope they didn’t write just to satisfy me that I did all I could, because I wrote a kind of an emotional email.
All colleges have added this to my application except Stanford (they haven’t replied in two working days).
Fingers crossed. Pi day has started.
Oh yes, Happy Pi Day to everyone! I really hope it is happy
Argh, I hope you didn’t REALLY write an emotional email. College adcoms aren’t and don’t want to be, your therapist or best friend.
Note that I had provided a workable model. I hope you used it.
Pi Day hasn’t started yet. 
about six hours to go
Yes sir @MYOS1634 , I just included one emotional line (well, it isn’t really that emotional).
After I said that it has come to my attention that this was an important achievement that had to be mentioned in my application, I said that I know it is too late and the admissions committee may have already made a final decision but I wanted to keep no regrets of no trying my best to get into my dream college.
That was the emotional part, that’s it
My country is 9 hours ahead of Eastern Time and when I posted that Pi day had started here
If that’s what you wrote that’s okay. It may have been emotional to write it but it’s still okay. Sometimes applicants include actual tearful pleas.
Rejected my MIT!
Got up at 3:30 AM (Local Time) to watch the disappointment!
Fingers crossed on the rest of them. It only takes one.
Next year you can try again for universities that admit on stats, have good honors college, and would offer you merit scholarships.
Sorry on the MIT news. Keep the Faith! As MYOS1634 points out you only need one and can only attend one. You are impressive and that will shine through.
@MYOS1634 , I will be applying to these universities again, but only after 4 years now
Even if I don’t get into any of the remaining colleges, I won’t be dropping a year, but I will go to NIT, or maybe even IIT (NIT is guaranteed, IIT is a bit tougher but I will be writing its entrance examination).
Anyways, its all a learning. There will be 2 more opportunities to get into these colleges- for the master’s degree and for a doctorate degree.
I want to become a research scientist. There is still a long way to go
Yes, I am disappointed, because MIT was the only institute who had literally taken into account every aspect of me like for my research I had to submit an additional portfolio, for my theatrics there was another portfolio, and the questions were very apt.
Still hoping for one of the ivies to say yes!
Even if they don’t, this was just one of the three tries I will have in my life for these top institutions
Thank you @MYOS1634 and @Nocreativity1 for the support. I really can’t express how much your comments help!
BTW, for the US in STEM, if your goal is a PhD, you apply for funded PhD programs directly straight from undergrad. Funded means you pay nothing. You pick up a master’s along the way. You should only consider applying to masters programs if you don’t get in to any funded PhD programs.
Just relax, sometimes the American dream isn’t really American, there are plenty of places where you can go and stand out, life isn’t a linear path.
@Justoneofthelot
I am an international student just like you
Thanks for sharing your story
Please share you Iv results
A lot of people of my school have bluffed in their profiles.
They have included stuff that they actually haven’t done, and it isn’t just one or two but about 15-20.
Just yesterday, someone was bragging in my school’s whatsapp group of getting into his dream college, and some of the others picked up a nasty fight with him. They chided him for adding false information in his college application.
He accepted it, but revealed names of several others who did similar stuff, and this created a chain reaction.
I haven’t exactly counted but about 15-20 of them bluffed big time!
They spoke about their “ground-breaking” research, start ups etc (fyi, they are so dumb that they didn’t even know that personal start ups are prohibited).
Can’t colleges just find out if they are bluffing? It is people like these who eat up seats of true candidates like me.
I know the situation in America must be a lot different, but what took place in my school’s whatsapp group has shaken me up.
Don’t colleges check their credentials or proof of so called start ups that they have ravenously talked about in their applications?
I find this morally wrong, and this has hurt me deeply, that is the reason I am sharing this with senior members at College Confidential, so that you all can convey to others that working hard is the key and ‘not bluffing’ is the moral mantra we as responsible future undergraduate students should follow.
Rejected from all colleges.
I don’t think I will be posting/commenting any more now.
So, goodbye everyone, and thank you for your time and help.
sorry @Justoneofthelot - I know it’s hard to receive such news, and is frustrating when you hear of others who are less deserving getting in. But I stay true to who you are and good things will find you.