Forget to take ITC

claim such ITC in next month 3B....

Yes u can take missed itc in april18 3b, just do prepare the reconciliation statement for the same

you can claim the ITC until 31 September and date of filling annual return whichever is earlier in respective finicial year.

Are You missed Your ITC in Previous months...??

If Yes... No need to worry about the mistake...

You can claim the ITC in Your next GSTR 3B return. As per above query You can take ITC in April month GSTR 3B return...

You ll book your Purchase in the purchased month in Your books of accounts and C/f the ITC to April...