What is your cycle history??? Have you ever taken Anavar (var) before??
What is your current training routine (list all days and approx routine, i.e. mon-bjj, tue-run, wed-stand up and weights, etc., etc.)
And, how long have you been "competing" at mma and how many times have you been in the cage total??
These are all very important things to know before giving SOLID advice.. Plus somethings to keep in mind..
1) You are right, its not advisable to take oral anabolics without at least a base of test. Yes, it can be done but its just not optimal... but we'll touch on that later.
2) Although Anavar (var) is a somewhat mild anabolic, its no joke. Its effects are very real and can cause some "unwanted" side effects for certain athletes. For example, MMA (like wrestling/grappling) is an extremely demanding sport with matches requiring all out use of cardio, strength, muscular endurance, power, etc. and Anavar (var) at 50mg/daily can easily cause pumps so bad, it feels like severe cramping. First time users have also reported head rushes, feeling flush, running hot, etc. when combined with high intensity cardio/conditioning.. of course that goes away but its still a concern off the bat.
3) Your natural test production can and most likely will be shutdown on doses of over 15mg/daily. To what degree is diferent from person to person but less testosterone is bad anyway you slice it. It can mean decreased recovery, decline in strength, less drive, etc, etc.. (too many to list). This is why its always important to run a base of test.
4) If your fight is approx 4 weeks, I'd reconsider adding something like gear to the routine this close to a fight. I'm not saying its going to screw things up but it very well could.
..in short, just trying to help bro. My advice would be to wait until you have no fight to throw something in like this and test the waters. I personally know how demanding MMA can be.