I’m in the IB program at my school, and I’m planning on going for the diploma. This year (junior) I am taking:
IB HL English 1
IB HL HOA 1 (1st semester) TOK(2nd)
IB HL Math 1
IB SL Computer Science
IB SL Spanish
Honors Anatomy and Physiology
Next year I plan on taking:
AP Physics (my school doesn’t have IB Physics) and IB Economics
Is this rigorous enough for the diploma?
If you want to be in the IB diploma program you need to take 6 IB classes over Jr and Sr year, at least 3 and no more than 4 HL, and the others SL. Your plan looks like it meets that, so you should be fine. To earn the diploma you need to get at least a total of 24 or higher for the sum of all your IB exam grades, as long as you meet all the other requirements as shown on the IB site: http://www.ibo.org/globalassets/publications/become-an-ib-school/dp-general-regulatioin-2014.pdf
For the rigour of your courses, it really depends on what classes your school offers. Different schools offer different IB courses. Getting an IB diploma is dependent on what pd2016 said, not how rigorous your courses are.