How can I only get tasks from the "Joint search of ODLS12 with Gerasim project (%)" part of the project?

These tasks are only seconds long, compared to the others, which take much longer, which I why I'd love to only get these small tasks, so all these can be finished first, before taking on the big tasks in the other parts of the project.

From your home page go to:
Preferences for this project RakeSearch preferences

Once there scroll to
Edit preferences for the venue your PC(s) are in for the project (unless you have changed it it will be the first one, "Primary (default) preferences")

Once at the proper venue page scroll down to
Run only the selected applications
Check/uncheck the boxes by the task type you do and don't want to run (empty box == not run).

Make sure the "If no work for selected applications is available, accept work from other applications?" box is unchecked/empty.

Scroll down to the Green Update button near bottom of page, click on it to save changes.

Open the BOINC program on your PC(s), tap on the Application tab, scroll down to the listing for this project and click update so BOINC can receive the updated instructions.

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Thanks for that, but now, only task for the ODLS12 Gerasim project remains, so this isn't really relevant anymore, and there are still big tasks in this remaining project, which is why I just select them, and abort them whenever they show up, and then BOINC starts doing the other small tasks instead. As good as it gets for now.