study text and exam kit

A kit is essential for question practice (either BPP or Kaplan, but you get a 20% discount on BPP books bought through this site). As for texts, see my answer to your other posting.

Shall I do past papers or kaplan exam kit first? Is it possible to do past papers topic wise?

Are technical articles worth it in case of sbl exam as it's fully application based?

Yes. They often provide examples of application.