Urgent ! Attention Required "Query Issues"

Urgent ! Attention Required "Query Issues"

Hi I have two tables Testing101 and testing102 . testing101 has to columns A and B while testing102 has two columns A-1 and B-1, each has got two rows

Now I want to sum up Columns A from testing101 and column A-1 from testing102, how can I do that? I am a novice and new to zoho, help me out ASAP !