want to know What are vehicle registration summaries and titles?
do not
want to know How do you get the registration summary of your vehicle?
Yes
You can request your vehicle registration summary using the DMV Registration Request PDF MV-15 form.
And how would I do in case I don't remember my license plate number?
provide your DOB name and date of birth as well as vehicle make and year
And what other things do I have to submit with my application?
a photocopy of your driver's license or other government-issued photo identification card as proof of identity  a personal check or money order made payable to the "Commissioner of Motor Vehicles" to pay the search fee of $ 10.00
and can i request by mail?
You can request your vehicle or title registration summaries by mail using the DMV MV-15 Registration Request
How do I obtain the summary of the registration of the title of my vehicle?