I'm afraid we never got a score from any of our questionnaires (actually they really just interviewed us, rather than doing a formal questionnaire - and similarly they went to visit DD and her teachers at nursery, so there was no formal feedback from that - more qualitative in her Dx report).
It's really hard while you're waiting for Dx. We did do stuff but not too much and we were never really sure if they were the right things. We did a lot towards physical confidence, and quite a bit on turn taking/social confidence kind of stuff, and then some on understanding emotions and managing anxiety. Once she started school we just tried to make home as calm as possible. You can do a bit of skills teaching but I don't think it can be too full on as they just need to rest and recover, school is such a big drain!
We're finally doing the NAS Early Bird + course which would have been useful 2.5 years ago when we were first told DD was probably autistic but now ... not so much really!
There are some really good books out there to give you ideas in the mean time though. How to Raise a Happy Autistic Child by Jessie Hewitson is really good, as is Autism and Asperger Syndrome in Childhood by Dr Luke Beardon. Both very positive and particularly Luke Beardon's is very focused on the autistic person's perspective (he has another older book about adults that is on my "to read" list!)
If your son has any issues with communication or social/sensory issues then the Chirp YouTube channel is really good (she's an SLT but also has lots of videos on social stuff, engagement, sensory issues - loads of useful stuff and not horribly negative/ableist like some of the therapy sites are). www.youtube.com/channel/UCfYVQf91yvCwAfZGn1vrypQ
You should also join our thread called something like "Year 1 Auties" - a few of the parents there actually have kids in reception so might well have ideas (and the rest of us can probably just about remember last year - or you might find the older versions of the thread useful, that are linked on the front page).
The Nurturing Neurodiversity YouTube channel and Facebook page is also really nice - lots of parents there are still pre-Dx.
Reading books about emotions can be helpful, and getting DS involved in decisions and problem solving around his emotions. Actually if you look at Chirp's recent review of the "Explosive Child" book that might be useful (it's actually about involving your child in problem solving after the event/not in the heat of emotion - not just for explosive children!)
There are various materials on the web which are similar to the EarlyBird course (e.g. I found this from a quick Google) but I don't know how useful they'd be without the course leader (plus the "Am I being Annoying" page is very annoying 
). Probably the books and videos are a better bet, but this is a good overview of the kind of resources that you will probably be pointed at if you do get a Dx, so probably worth a look!
daslne.org/media/sites/researchwebsites/daslne/Daslne%202015%20Strategies%20to%20help%20young%20children%20with%20Autism%20Spectrum%20Disorder%20make%20sense%20of%20their%20world.pdf