Filing of gstr 1 and claiming itc

1. tax invoice cannot be issued before registration.....
2. No you cannot claim itc of that as your gst no. would have not been mentioned on that invoice... alternatively you can ask your supplier to Amemd the date of invoice such that it can fall after registration and also amend his gstr 1, so that you can claim itc of that invoice.

No you cannot claim itc by this way..

if you want to claim itc of stock in hand as on date of registration then you can claim by filing itc 01 form