How much better does your math level 1 score need to be to submit it

Student has taken honors precalculus, and I helped him improve from 610 to 700 on the math SAT. Top 50 schools are generally looking for 700+ on subject tests, but many schools would like to see math level 2 for engineering and will take 600+.

Student initially was going to take math level 1. I suggested to parent that he take math level 2, as he had honors precalc, and most people submit level 2 for engineering or top schools. Student preferred level 2, as forgot a lot of the earlier math. However, he is getting almost all of problems 35-50 wrong, so thought we might consider level 1.